Vulnerability-Lookup

GHSA-5QHG-9PM8-2MWP

Vulnerability from github – Published: 2026-10-28 03:31 – Updated: 2026-10-28 03:31

Details

LibreSSL ocspcheck through 4.4.0 contains a CRLF injection vulnerability that allows attackers to inject HTTP headers by embedding CR/LF sequences in a certificate's AIA OCSP URI path. Because url2host() copies the path without rejecting control characters and http_open() places it in the POST request line, attackers can inject headers or split OCSP requests sent to the responder host.

Severity

3.7 (Low)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

6.3 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-118372"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-93"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-28T03:17:13Z",
    "severity": "MODERATE"
  },
  "details": "LibreSSL ocspcheck through 4.4.0 contains a CRLF injection vulnerability that allows attackers to inject HTTP headers by embedding CR/LF sequences in a certificate\u0027s AIA OCSP URI path. Because url2host() copies the path without rejecting control characters and http_open() places it in the POST request line, attackers can inject headers or split OCSP requests sent to the responder host.",
  "id": "GHSA-5qhg-9pm8-2mwp",
  "modified": "2026-10-28T03:31:51Z",
  "published": "2026-10-28T03:31:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118372"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openbsd/src/commit/3adb7688a5bcfb675fa6d8b10e242022d620a23d"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openbsd/src/commit/6efdc4cce3fac9fa7208a9452f84de34c5a68e9f"
    },
    {
      "type": "WEB",
      "url": "https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-4.4.0-relnotes.txt"
    },
    {
      "type": "WEB",
      "url": "https://github.com/libressl/portable"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openbsd/src/blob/17a8e44328ee2505d69723a126a390a526e50370/usr.sbin/ocspcheck/http.c#L344"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openbsd/src/blob/17a8e44328ee2505d69723a126a390a526e50370/usr.sbin/ocspcheck/ocspcheck.c#L154"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/libressl-ocspcheck-through-4.4.0-crlf-injection-via-aia-ocsp-url-path"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/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",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-118372 (GCVE-0-2026-118372)

Vulnerability from cvelistv5 – Published: 2026-10-28 02:03 – Updated: 2026-10-28 16:11

Title

LibreSSL ocspcheck through 4.4.0 CRLF Injection via AIA OCSP URL Path

Summary

Severity

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

3.7 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-28 14:35 UTC

CWE

CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7152 records in the last 180 days details

References

7 references

URL	Tags
https://github.com/openbsd/src/commit/6efdc4cce3f…	patch
https://github.com/openbsd/src/commit/3adb7688a5b…	patch
https://github.com/openbsd/src/blob/17a8e44328ee2…	technical-description
https://github.com/openbsd/src/blob/17a8e44328ee2…	technical-description
https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libr…	release-notes
https://github.com/libressl/portable	product
https://www.vulncheck.com/advisories/libressl-ocs…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
OpenBSD	LibreSSL	Affected: 0 , ≤ 4.4.0 (semver) cpe:2.3:a:openbsd:libressl::::::::

Date Public

2026-10-19 00:00

Credits

Aziz Elbelaychy (Ostorlab) Kenjiro Nakayama

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-118372",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-28T14:35:30.401668Z",
                "version": "2.0.3"
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              "type": "ssvc"
            }
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-28T16:11:41.029Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/libressl/portable",
          "product": "LibreSSL",
          "repo": "https://github.com/libressl/portable",
          "vendor": "OpenBSD",
          "versions": [
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      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:openbsd:libressl:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "4.4.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "Aziz Elbelaychy (Ostorlab)"
        },
        {
          "lang": "en",
          "type": "remediation developer",
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        {
          "lang": "en",
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        }
      ],
      "metrics": [
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            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
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            "baseScore": 6.3,
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            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
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            "vulnConfidentialityImpact": "NONE",
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      "references": [
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          "url": "https://github.com/openbsd/src/commit/6efdc4cce3fac9fa7208a9452f84de34c5a68e9f"
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        {
          "tags": [
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          "url": "https://github.com/openbsd/src/blob/17a8e44328ee2505d69723a126a390a526e50370/usr.sbin/ocspcheck/ocspcheck.c#L154"
        },
        {
          "name": "LibreSSL 4.4.0 Release Notes",
          "tags": [
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        },
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          "tags": [
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        }
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    "datePublished": "2026-10-28T02:03:20.849Z",
    "dateReserved": "2026-10-28T01:19:20.199Z",
    "dateUpdated": "2026-10-28T16:11:41.029Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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

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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.
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