CVE-2026-114216 (GCVE-0-2026-114216)
Vulnerability from cvelistv5 – Published: 2026-10-26 13:30 – Updated: 2026-10-26 15:35
VLAI
EPSS
VEX
Title
Chunk extensions accept bare LF and CR, enabling request smuggling in Bandit
Summary
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in the HTTP/1.1 chunked body reader of mtrudel bandit allows an unauthenticated remote attacker to smuggle a second request past a front-end proxy via a chunk extension that contains a bare LF.
The chunked reader in lib/bandit/http1/socket.ex takes the chunk-size line to be everything up to the first CRLF and discards everything after ; without checking it against the RFC 9112 chunk-ext grammar, so bare LF, bare CR and other control bytes pass. A proxy that ends the size line at a bare LF reads 2;\nxx\r\n40\r\n... as one request whose second chunk holds a GET /admin, while Bandit ends the body early and dispatches GET /admin as a separate pipelined request. Deployments without such a proxy in front of Bandit are not affected.
This issue affects bandit: from 1.12.4 before 1.14.0.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-26 15:03 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/mtrudel/bandit/security/adviso… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-114216.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-114216 | related |
| https://github.com/mtrudel/bandit/commit/c31e9e3c… | related |
| https://github.com/mtrudel/bandit/commit/220b9dfd… | patch |
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-114216",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-26T15:03:20.382433Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-10-26T15:35:51.933Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"packageName": "bandit",
"packageURL": "pkg:hex/bandit",
"product": "bandit",
"repo": "https://github.com/mtrudel/bandit",
"vendor": "mtrudel",
"versions": [
{
"lessThan": "1.14.0",
"status": "affected",
"version": "1.12.4",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"packageName": "mtrudel/bandit",
"packageURL": "pkg:github/mtrudel/bandit",
"product": "bandit",
"repo": "https://github.com/mtrudel/bandit",
"vendor": "mtrudel",
"versions": [
{
"lessThan": "220b9dfd27f9a21305be2afc75cbe585ddc24e7a",
"status": "affected",
"version": "c31e9e3c76dcbfc239a96eabed5341ced7885ae5",
"versionType": "git"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.14.0",
"versionStartIncluding": "1.12.4",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "Peter Ullrich"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Mat Trudel"
},
{
"lang": "en",
"type": "analyst",
"value": "Jonatan M\u00e4nnchen / EEF"
}
],
"dateAssigned": "2026-10-23T12:59:00.000Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eInconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027) vulnerability in the HTTP/1.1 chunked body reader of mtrudel bandit allows an unauthenticated remote attacker to smuggle a second request past a front-end proxy via a chunk extension that contains a bare LF.\u003c/p\u003e\n\u003cp\u003eThe chunked reader in \u003ccode\u003elib/bandit/http1/socket.ex\u003c/code\u003e takes the chunk-size line to be everything up to the first CRLF and discards everything after \u003ccode\u003e;\u003c/code\u003e without checking it against the RFC 9112 \u003ccode\u003echunk-ext\u003c/code\u003e grammar, so bare LF, bare CR and other control bytes pass. A proxy that ends the size line at a bare LF reads \u003ccode\u003e2;\\nxx\\r\\n40\\r\\n...\u003c/code\u003e as one request whose second chunk holds a \u003ccode\u003eGET /admin\u003c/code\u003e, while Bandit ends the body early and dispatches \u003ccode\u003eGET /admin\u003c/code\u003e as a separate pipelined request. Deployments without such a proxy in front of Bandit are not affected.\u003c/p\u003e\n\u003cp\u003eThis issue affects bandit: from 1.12.4 before 1.14.0.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027) vulnerability in the HTTP/1.1 chunked body reader of mtrudel bandit allows an unauthenticated remote attacker to smuggle a second request past a front-end proxy via a chunk extension that contains a bare LF.\n\nThe chunked reader in `lib/bandit/http1/socket.ex` takes the chunk-size line to be everything up to the first CRLF and discards everything after `;` without checking it against the RFC 9112 `chunk-ext` grammar, so bare LF, bare CR and other control bytes pass. A proxy that ends the size line at a bare LF reads `2;\\nxx\\r\\n40\\r\\n...` as one request whose second chunk holds a `GET /admin`, while Bandit ends the body early and dispatches `GET /admin` as a separate pipelined request. Deployments without such a proxy in front of Bandit are not affected.\n\nThis issue affects bandit: from 1.12.4 before 1.14.0."
}
],
"value": "Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027) vulnerability in the HTTP/1.1 chunked body reader of mtrudel bandit allows an unauthenticated remote attacker to smuggle a second request past a front-end proxy via a chunk extension that contains a bare LF.\n\nThe chunked reader in lib/bandit/http1/socket.ex takes the chunk-size line to be everything up to the first CRLF and discards everything after ; without checking it against the RFC 9112 chunk-ext grammar, so bare LF, bare CR and other control bytes pass. A proxy that ends the size line at a bare LF reads 2;\\nxx\\r\\n40\\r\\n... as one request whose second chunk holds a GET /admin, while Bandit ends the body early and dispatches GET /admin as a separate pipelined request. Deployments without such a proxy in front of Bandit are not affected.\n\nThis issue affects bandit: from 1.12.4 before 1.14.0."
}
],
"impacts": [
{
"capecId": "CAPEC-33",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eBehind a front-end proxy that treats a bare LF as a line ending and forwards chunked bodies unchanged, an unauthenticated attacker can have Bandit run requests the proxy never saw, getting past the proxy\u0027s access controls.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "Behind a front-end proxy that treats a bare LF as a line ending and forwards chunked bodies unchanged, an unauthenticated attacker can have Bandit run requests the proxy never saw, getting past the proxy\u0027s access controls."
}
],
"value": "Behind a front-end proxy that treats a bare LF as a line ending and forwards chunked bodies unchanged, an unauthenticated attacker can have Bandit run requests the proxy never saw, getting past the proxy\u0027s access controls."
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "LOW",
"subIntegrityImpact": "LOW",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "LOW",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-444",
"description": "CWE-444 Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-26T13:30:41.225Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"name": "Chunk extensions accept bare LF and CR, enabling request smuggling in Bandit",
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/mtrudel/bandit/security/advisories/GHSA-w5wc-g2hc-g7m2"
},
{
"name": "EEF CNA record for CVE-2026-114216",
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-114216.html"
},
{
"name": "OSV record EEF-CVE-2026-114216",
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-114216"
},
{
"name": "Introducing commit c31e9e3 in mtrudel/bandit",
"tags": [
"related"
],
"url": "https://github.com/mtrudel/bandit/commit/c31e9e3c76dcbfc239a96eabed5341ced7885ae5"
},
{
"name": "Fix commit 220b9df in mtrudel/bandit",
"tags": [
"patch"
],
"url": "https://github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7a"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Chunk extensions accept bare LF and CR, enabling request smuggling in Bandit",
"workarounds": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eWhere the front-end proxy can reach Bandit over HTTP/2, disable HTTP/1 with \u003ccode\u003ehttp_1_options: [enabled: false]\u003c/code\u003e, so that the chunked body reader never runs.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "Where the front-end proxy can reach Bandit over HTTP/2, disable HTTP/1 with `http_1_options: [enabled: false]`, so that the chunked body reader never runs."
}
],
"value": "Where the front-end proxy can reach Bandit over HTTP/2, disable HTTP/1 with http_1_options: [enabled: false], so that the chunked body reader never runs."
}
],
"x_proofOfConcept": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003col\u003e\n\u003cli\u003eRun Bandit with a Plug that reads the body and records each request\u0027s method and path.\u003c/li\u003e\n\u003cli\u003eOn one connection, send \u003ccode\u003ePOST /public\u003c/code\u003e with \u003ccode\u003eTransfer-Encoding: chunked\u003c/code\u003e and the body \u003ccode\u003e2;\\nxx\\r\\n40\\r\\n0\\r\\n\\r\\n\u003c/code\u003e, followed directly by \u003ccode\u003eGET /admin HTTP/1.1\u003c/code\u003e with \u003ccode\u003eContent-Length: 7\u003c/code\u003e and the body \u003ccode\u003e\\r\\n0\\r\\n\\r\\n\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eBandit dispatches both \u003ccode\u003ePOST /public\u003c/code\u003e with the body \u003ccode\u003e40\u003c/code\u003e and \u003ccode\u003eGET /admin\u003c/code\u003e. A proxy that ends lines at a bare LF would have forwarded the same bytes as the single \u003ccode\u003ePOST /public\u003c/code\u003e.\u003c/li\u003e\n\u003c/ol\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "1. Run Bandit with a Plug that reads the body and records each request\u0027s method and path.\n2. On one connection, send `POST /public` with `Transfer-Encoding: chunked` and the body `2;\\nxx\\r\\n40\\r\\n0\\r\\n\\r\\n`, followed directly by `GET /admin HTTP/1.1` with `Content-Length: 7` and the body `\\r\\n0\\r\\n\\r\\n`.\n3. Bandit dispatches both `POST /public` with the body `40` and `GET /admin`. A proxy that ends lines at a bare LF would have forwarded the same bytes as the single `POST /public`."
}
],
"value": "* Run Bandit with a Plug that reads the body and records each request\u0027s method and path.\n* On one connection, send POST /public with Transfer-Encoding: chunked and the body 2;\\nxx\\r\\n40\\r\\n0\\r\\n\\r\\n, followed directly by GET /admin HTTP/1.1 with Content-Length: 7 and the body \\r\\n0\\r\\n\\r\\n.\n* Bandit dispatches both POST /public with the body 40 and GET /admin. A proxy that ends lines at a bare LF would have forwarded the same bytes as the single POST /public."
}
],
"x_technicalAnalysis": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003e\u003cstrong\u003e1. Unchecked extension.\u003c/strong\u003e In \u003ccode\u003elib/bandit/http1/socket.ex\u003c/code\u003e, the chunked body reader takes the chunk-size line to be everything up to the first CRLF. Anything after \u003ccode\u003e;\u003c/code\u003e is thrown away without being checked against the RFC 9112 \u00a77.1.1 \u003ccode\u003echunk-ext\u003c/code\u003e grammar, so bare LF, bare CR and other control bytes are accepted. The 16-byte size-line cap does not help, because the payload needs only 5 bytes.\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003e2. Bandit\u0027s reading.\u003c/strong\u003e For the body \u003ccode\u003e2;\\nxx\\r\\n40\\r\\n0\\r\\n\\r\\nGET /admin ...\u003c/code\u003e, Bandit takes \u003ccode\u003e2;\\nxx\u003c/code\u003e as the size line and \u003ccode\u003e40\u003c/code\u003e as the 2-byte chunk, and the embedded \u003ccode\u003e0\\r\\n\\r\\n\u003c/code\u003e ends the body. Bandit then runs \u003ccode\u003eGET /admin\u003c/code\u003e as a second pipelined request.\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003e3. The proxy\u0027s reading.\u003c/strong\u003e A proxy that ends the size line at the bare LF sees only one POST, with the chunk \u003ccode\u003exx\u003c/code\u003e and a 0x40-byte chunk that holds the \u003ccode\u003eGET /admin\u003c/code\u003e bytes.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "**1. Unchecked extension.** In `lib/bandit/http1/socket.ex`, the chunked body reader takes the chunk-size line to be everything up to the first CRLF. Anything after `;` is thrown away without being checked against the RFC 9112 \u00a77.1.1 `chunk-ext` grammar, so bare LF, bare CR and other control bytes are accepted. The 16-byte size-line cap does not help, because the payload needs only 5 bytes.\n\n**2. Bandit\u0027s reading.** For the body `2;\\nxx\\r\\n40\\r\\n0\\r\\n\\r\\nGET /admin ...`, Bandit takes `2;\\nxx` as the size line and `40` as the 2-byte chunk, and the embedded `0\\r\\n\\r\\n` ends the body. Bandit then runs `GET /admin` as a second pipelined request.\n\n**3. The proxy\u0027s reading.** A proxy that ends the size line at the bare LF sees only one POST, with the chunk `xx` and a 0x40-byte chunk that holds the `GET /admin` bytes."
}
],
"value": "1. Unchecked extension. In lib/bandit/http1/socket.ex, the chunked body reader takes the chunk-size line to be everything up to the first CRLF. Anything after ; is thrown away without being checked against the RFC 9112 \u00a77.1.1 chunk-ext grammar, so bare LF, bare CR and other control bytes are accepted. The 16-byte size-line cap does not help, because the payload needs only 5 bytes.\n\n2. Bandit\u0027s reading. For the body 2;\\nxx\\r\\n40\\r\\n0\\r\\n\\r\\nGET /admin ..., Bandit takes 2;\\nxx as the size line and 40 as the 2-byte chunk, and the embedded 0\\r\\n\\r\\n ends the body. Bandit then runs GET /admin as a second pipelined request.\n\n3. The proxy\u0027s reading. A proxy that ends the size line at the bare LF sees only one POST, with the chunk xx and a 0x40-byte chunk that holds the GET /admin bytes."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-114216",
"datePublished": "2026-10-26T13:30:41.225Z",
"dateReserved": "2026-10-23T10:45:02.529Z",
"dateUpdated": "2026-10-26T15:35:51.933Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-114216",
"date": "2026-11-12",
"epss": "0.00602",
"percentile": "0.4933"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"packageName": "bandit",
"packageURL": "pkg:hex/bandit",
"product": "bandit",
"repo": "https://github.com/mtrudel/bandit",
"vendor": "mtrudel",
"versions": [
{
"lessThan": "1.14.0",
"status": "affected",
"version": "1.12.4",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"packageName": "mtrudel/bandit",
"packageURL": "pkg:github/mtrudel/bandit",
"product": "bandit",
"repo": "https://github.com/mtrudel/bandit",
"vendor": "mtrudel",
"versions": [
{
"lessThan": "220b9dfd27f9a21305be2afc75cbe585ddc24e7a",
"status": "affected",
"version": "c31e9e3c76dcbfc239a96eabed5341ced7885ae5",
"versionType": "git"
}
]
}
],
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027) vulnerability in the HTTP/1.1 chunked body reader of mtrudel bandit allows an unauthenticated remote attacker to smuggle a second request past a front-end proxy via a chunk extension that contains a bare LF.\n\nThe chunked reader in lib/bandit/http1/socket.ex takes the chunk-size line to be everything up to the first CRLF and discards everything after ; without checking it against the RFC 9112 chunk-ext grammar, so bare LF, bare CR and other control bytes pass. A proxy that ends the size line at a bare LF reads 2;\\nxx\\r\\n40\\r\\n... as one request whose second chunk holds a GET /admin, while Bandit ends the body early and dispatches GET /admin as a separate pipelined request. Deployments without such a proxy in front of Bandit are not affected.\n\nThis issue affects bandit: from 1.12.4 before 1.14.0."
}
],
"id": "CVE-2026-114216",
"lastModified": "2026-10-26T16:59:16.113",
"metrics": {
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "LOW",
"subIntegrityImpact": "LOW",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "LOW",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-114216",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-26T15:03:20.382433Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-10-26T14:16:29.613",
"references": [
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://cna.erlef.org/cves/CVE-2026-114216.html"
},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7a"
},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://github.com/mtrudel/bandit/commit/c31e9e3c76dcbfc239a96eabed5341ced7885ae5"
},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://github.com/mtrudel/bandit/security/advisories/GHSA-w5wc-g2hc-g7m2"
},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-114216"
}
],
"sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-444"
}
],
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"type": "Secondary"
}
]
}
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-114216",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-26T15:03:20.382433Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-10-26T15:33:02.440Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"packageName": "bandit",
"packageURL": "pkg:hex/bandit",
"product": "bandit",
"repo": "https://github.com/mtrudel/bandit",
"vendor": "mtrudel",
"versions": [
{
"lessThan": "1.14.0",
"status": "affected",
"version": "1.12.4",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"packageName": "mtrudel/bandit",
"packageURL": "pkg:github/mtrudel/bandit",
"product": "bandit",
"repo": "https://github.com/mtrudel/bandit",
"vendor": "mtrudel",
"versions": [
{
"lessThan": "220b9dfd27f9a21305be2afc75cbe585ddc24e7a",
"status": "affected",
"version": "c31e9e3c76dcbfc239a96eabed5341ced7885ae5",
"versionType": "git"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.14.0",
"versionStartIncluding": "1.12.4",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "Peter Ullrich"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Mat Trudel"
},
{
"lang": "en",
"type": "analyst",
"value": "Jonatan M\u00e4nnchen / EEF"
}
],
"dateAssigned": "2026-10-23T12:59:00.000Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eInconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027) vulnerability in the HTTP/1.1 chunked body reader of mtrudel bandit allows an unauthenticated remote attacker to smuggle a second request past a front-end proxy via a chunk extension that contains a bare LF.\u003c/p\u003e\n\u003cp\u003eThe chunked reader in \u003ccode\u003elib/bandit/http1/socket.ex\u003c/code\u003e takes the chunk-size line to be everything up to the first CRLF and discards everything after \u003ccode\u003e;\u003c/code\u003e without checking it against the RFC 9112 \u003ccode\u003echunk-ext\u003c/code\u003e grammar, so bare LF, bare CR and other control bytes pass. A proxy that ends the size line at a bare LF reads \u003ccode\u003e2;\\nxx\\r\\n40\\r\\n...\u003c/code\u003e as one request whose second chunk holds a \u003ccode\u003eGET /admin\u003c/code\u003e, while Bandit ends the body early and dispatches \u003ccode\u003eGET /admin\u003c/code\u003e as a separate pipelined request. Deployments without such a proxy in front of Bandit are not affected.\u003c/p\u003e\n\u003cp\u003eThis issue affects bandit: from 1.12.4 before 1.14.0.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027) vulnerability in the HTTP/1.1 chunked body reader of mtrudel bandit allows an unauthenticated remote attacker to smuggle a second request past a front-end proxy via a chunk extension that contains a bare LF.\n\nThe chunked reader in `lib/bandit/http1/socket.ex` takes the chunk-size line to be everything up to the first CRLF and discards everything after `;` without checking it against the RFC 9112 `chunk-ext` grammar, so bare LF, bare CR and other control bytes pass. A proxy that ends the size line at a bare LF reads `2;\\nxx\\r\\n40\\r\\n...` as one request whose second chunk holds a `GET /admin`, while Bandit ends the body early and dispatches `GET /admin` as a separate pipelined request. Deployments without such a proxy in front of Bandit are not affected.\n\nThis issue affects bandit: from 1.12.4 before 1.14.0."
}
],
"value": "Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027) vulnerability in the HTTP/1.1 chunked body reader of mtrudel bandit allows an unauthenticated remote attacker to smuggle a second request past a front-end proxy via a chunk extension that contains a bare LF.\n\nThe chunked reader in lib/bandit/http1/socket.ex takes the chunk-size line to be everything up to the first CRLF and discards everything after ; without checking it against the RFC 9112 chunk-ext grammar, so bare LF, bare CR and other control bytes pass. A proxy that ends the size line at a bare LF reads 2;\\nxx\\r\\n40\\r\\n... as one request whose second chunk holds a GET /admin, while Bandit ends the body early and dispatches GET /admin as a separate pipelined request. Deployments without such a proxy in front of Bandit are not affected.\n\nThis issue affects bandit: from 1.12.4 before 1.14.0."
}
],
"impacts": [
{
"capecId": "CAPEC-33",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eBehind a front-end proxy that treats a bare LF as a line ending and forwards chunked bodies unchanged, an unauthenticated attacker can have Bandit run requests the proxy never saw, getting past the proxy\u0027s access controls.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "Behind a front-end proxy that treats a bare LF as a line ending and forwards chunked bodies unchanged, an unauthenticated attacker can have Bandit run requests the proxy never saw, getting past the proxy\u0027s access controls."
}
],
"value": "Behind a front-end proxy that treats a bare LF as a line ending and forwards chunked bodies unchanged, an unauthenticated attacker can have Bandit run requests the proxy never saw, getting past the proxy\u0027s access controls."
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "LOW",
"subIntegrityImpact": "LOW",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "LOW",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-444",
"description": "CWE-444 Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-26T13:30:41.225Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"name": "Chunk extensions accept bare LF and CR, enabling request smuggling in Bandit",
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/mtrudel/bandit/security/advisories/GHSA-w5wc-g2hc-g7m2"
},
{
"name": "EEF CNA record for CVE-2026-114216",
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-114216.html"
},
{
"name": "OSV record EEF-CVE-2026-114216",
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-114216"
},
{
"name": "Introducing commit c31e9e3 in mtrudel/bandit",
"tags": [
"related"
],
"url": "https://github.com/mtrudel/bandit/commit/c31e9e3c76dcbfc239a96eabed5341ced7885ae5"
},
{
"name": "Fix commit 220b9df in mtrudel/bandit",
"tags": [
"patch"
],
"url": "https://github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7a"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Chunk extensions accept bare LF and CR, enabling request smuggling in Bandit",
"workarounds": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eWhere the front-end proxy can reach Bandit over HTTP/2, disable HTTP/1 with \u003ccode\u003ehttp_1_options: [enabled: false]\u003c/code\u003e, so that the chunked body reader never runs.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "Where the front-end proxy can reach Bandit over HTTP/2, disable HTTP/1 with `http_1_options: [enabled: false]`, so that the chunked body reader never runs."
}
],
"value": "Where the front-end proxy can reach Bandit over HTTP/2, disable HTTP/1 with http_1_options: [enabled: false], so that the chunked body reader never runs."
}
],
"x_proofOfConcept": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003col\u003e\n\u003cli\u003eRun Bandit with a Plug that reads the body and records each request\u0027s method and path.\u003c/li\u003e\n\u003cli\u003eOn one connection, send \u003ccode\u003ePOST /public\u003c/code\u003e with \u003ccode\u003eTransfer-Encoding: chunked\u003c/code\u003e and the body \u003ccode\u003e2;\\nxx\\r\\n40\\r\\n0\\r\\n\\r\\n\u003c/code\u003e, followed directly by \u003ccode\u003eGET /admin HTTP/1.1\u003c/code\u003e with \u003ccode\u003eContent-Length: 7\u003c/code\u003e and the body \u003ccode\u003e\\r\\n0\\r\\n\\r\\n\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eBandit dispatches both \u003ccode\u003ePOST /public\u003c/code\u003e with the body \u003ccode\u003e40\u003c/code\u003e and \u003ccode\u003eGET /admin\u003c/code\u003e. A proxy that ends lines at a bare LF would have forwarded the same bytes as the single \u003ccode\u003ePOST /public\u003c/code\u003e.\u003c/li\u003e\n\u003c/ol\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "1. Run Bandit with a Plug that reads the body and records each request\u0027s method and path.\n2. On one connection, send `POST /public` with `Transfer-Encoding: chunked` and the body `2;\\nxx\\r\\n40\\r\\n0\\r\\n\\r\\n`, followed directly by `GET /admin HTTP/1.1` with `Content-Length: 7` and the body `\\r\\n0\\r\\n\\r\\n`.\n3. Bandit dispatches both `POST /public` with the body `40` and `GET /admin`. A proxy that ends lines at a bare LF would have forwarded the same bytes as the single `POST /public`."
}
],
"value": "* Run Bandit with a Plug that reads the body and records each request\u0027s method and path.\n* On one connection, send POST /public with Transfer-Encoding: chunked and the body 2;\\nxx\\r\\n40\\r\\n0\\r\\n\\r\\n, followed directly by GET /admin HTTP/1.1 with Content-Length: 7 and the body \\r\\n0\\r\\n\\r\\n.\n* Bandit dispatches both POST /public with the body 40 and GET /admin. A proxy that ends lines at a bare LF would have forwarded the same bytes as the single POST /public."
}
],
"x_technicalAnalysis": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003e\u003cstrong\u003e1. Unchecked extension.\u003c/strong\u003e In \u003ccode\u003elib/bandit/http1/socket.ex\u003c/code\u003e, the chunked body reader takes the chunk-size line to be everything up to the first CRLF. Anything after \u003ccode\u003e;\u003c/code\u003e is thrown away without being checked against the RFC 9112 \u00a77.1.1 \u003ccode\u003echunk-ext\u003c/code\u003e grammar, so bare LF, bare CR and other control bytes are accepted. The 16-byte size-line cap does not help, because the payload needs only 5 bytes.\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003e2. Bandit\u0027s reading.\u003c/strong\u003e For the body \u003ccode\u003e2;\\nxx\\r\\n40\\r\\n0\\r\\n\\r\\nGET /admin ...\u003c/code\u003e, Bandit takes \u003ccode\u003e2;\\nxx\u003c/code\u003e as the size line and \u003ccode\u003e40\u003c/code\u003e as the 2-byte chunk, and the embedded \u003ccode\u003e0\\r\\n\\r\\n\u003c/code\u003e ends the body. Bandit then runs \u003ccode\u003eGET /admin\u003c/code\u003e as a second pipelined request.\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003e3. The proxy\u0027s reading.\u003c/strong\u003e A proxy that ends the size line at the bare LF sees only one POST, with the chunk \u003ccode\u003exx\u003c/code\u003e and a 0x40-byte chunk that holds the \u003ccode\u003eGET /admin\u003c/code\u003e bytes.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "**1. Unchecked extension.** In `lib/bandit/http1/socket.ex`, the chunked body reader takes the chunk-size line to be everything up to the first CRLF. Anything after `;` is thrown away without being checked against the RFC 9112 \u00a77.1.1 `chunk-ext` grammar, so bare LF, bare CR and other control bytes are accepted. The 16-byte size-line cap does not help, because the payload needs only 5 bytes.\n\n**2. Bandit\u0027s reading.** For the body `2;\\nxx\\r\\n40\\r\\n0\\r\\n\\r\\nGET /admin ...`, Bandit takes `2;\\nxx` as the size line and `40` as the 2-byte chunk, and the embedded `0\\r\\n\\r\\n` ends the body. Bandit then runs `GET /admin` as a second pipelined request.\n\n**3. The proxy\u0027s reading.** A proxy that ends the size line at the bare LF sees only one POST, with the chunk `xx` and a 0x40-byte chunk that holds the `GET /admin` bytes."
}
],
"value": "1. Unchecked extension. In lib/bandit/http1/socket.ex, the chunked body reader takes the chunk-size line to be everything up to the first CRLF. Anything after ; is thrown away without being checked against the RFC 9112 \u00a77.1.1 chunk-ext grammar, so bare LF, bare CR and other control bytes are accepted. The 16-byte size-line cap does not help, because the payload needs only 5 bytes.\n\n2. Bandit\u0027s reading. For the body 2;\\nxx\\r\\n40\\r\\n0\\r\\n\\r\\nGET /admin ..., Bandit takes 2;\\nxx as the size line and 40 as the 2-byte chunk, and the embedded 0\\r\\n\\r\\n ends the body. Bandit then runs GET /admin as a second pipelined request.\n\n3. The proxy\u0027s reading. A proxy that ends the size line at the bare LF sees only one POST, with the chunk xx and a 0x40-byte chunk that holds the GET /admin bytes."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-114216",
"datePublished": "2026-10-26T13:30:41.225Z",
"dateReserved": "2026-10-23T10:45:02.529Z",
"dateUpdated": "2026-10-26T15:35:51.933Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
Loading timeline…
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.