RHSA-2026:88340
Vulnerability from csaf_redhat - Published: 2026-10-22 17:14 - Updated: 2026-10-26 17:12Summary
Red Hat Security Advisory: grafana security update
Severity
Important
Notes
Topic: An update for grafana is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Grafana is an open source, feature rich metrics dashboard and graph editor for Graphite, InfluxDB & OpenTSDB.
Security Fix(es):
* golang: net/http: net/http: sensitive headers incorrectly sent after cross-domain redirect (CVE-2024-45336)
* crypto/internal/nistec: golang: Timing sidechannel for P-256 on ppc64le in crypto/internal/nistec (CVE-2025-22866)
* crypto/tls: crypto/tls: Incorrect certificate validation during TLS session resumption (CVE-2025-68121)
* crypto/x509: Incorrect enforcement of email constraints in crypto/x509 (CVE-2026-27137)
* crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation (CVE-2026-32281)
* crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application (CVE-2026-33810)
* golang: internal/syscall/unix: Root.Chmod can follow symlinks out of the root (CVE-2026-32282)
* crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages (CVE-2026-32283)
* crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building (CVE-2026-32280)
* net/mail: golang: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499)
* net/mail: golang: Go net/mail: Denial of Service via crafted email inputs (CVE-2026-39820)
* golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821)
* mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header (CVE-2026-42504)
* encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818)
* net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860)
* net/http: golang: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service (CVE-2026-56853)
* html/template: golang: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858)
* crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862)
* encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue (CVE-2026-56859)
* crypto/x509: golang: crypto/x509: Man-in-the-middle attacks via untrusted intermediate certificates (CVE-2026-111943)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in the net/http package of the Golang standard library. The HTTP client drops sensitive headers after following a cross-domain redirect. For example, a request to `a.com/` containing an Authorization header redirected to `b.com/` will not send that header to `b.com`. However, the sensitive headers would be restored if the client received a subsequent same-domain redirect. For example, a chain of redirects from `a.com/`, to `b.com/1`, and finally to `b.com/2` would incorrectly send the Authorization header to `b.com/2`.
5.9 (Medium)
Affected products
Fixed
8 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-8.8.0.Z.E4S:grafana-0:7.5.15-12.el8_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:grafana-0:7.5.15-12.el8_8.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:grafana-0:7.5.15-12.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:grafana-debuginfo-0:7.5.15-12.el8_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:grafana-debuginfo-0:7.5.15-12.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.TUS:grafana-0:7.5.15-12.el8_8.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.TUS:grafana-0:7.5.15-12.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.TUS:grafana-debuginfo-0:7.5.15-12.el8_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in the Golang crypto/internal/nistec package. Due to the usage of a variable time instruction in the assembly implementation of an internal function, a small number of bits of secret scalars are leaked on the ppc64le architecture. Considering how this function is used, this leakage is likely insufficient to recover the private key when P-256 is used in any well-known protocols.
5.3 (Medium)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Moderate
A flaw was found in the crypto/tls component. This vulnerability occurs during Transport Layer Security (TLS) session resumption when certificate authority (CA) settings are modified between the initial and resumed handshakes. An attacker could exploit this to bypass certificate validation, allowing a client or server to establish a connection that should have been rejected. This could lead to an authentication bypass under specific conditions.
7.4 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Moderate
A certificate validation flaw has been discovered in the golang crypto/x509 module. When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local portions but different domain portions, these constraints will not be properly applied, and only the last constraint will be considered.
7.5 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Important
A flaw was found in the Go standard library packages `crypto/x509` and `crypto/tls`. During the process of building a certificate chain, an attacker can provide a large number of intermediate certificates. This excessive input is not properly limited, leading to an uncontrolled amount of work being performed. This can result in a denial of service (DoS) condition, making the affected system or application unavailable to legitimate users.
7.5 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Important
A flaw was found in Go's `crypto/x509` package. A remote attacker could exploit this by presenting a specially crafted certificate chain containing a large number of policy mappings. This inefficient validation process consumes excessive resources, which can lead to a denial of service (DoS) for applications or systems performing certificate validation.
5.9 (Medium)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Moderate
A flaw was found in the internal/syscall/unix package in the Go standard library. If the target of the `Root.Chmod` function is replaced with a symbolic link during execution, specifically after `Root.Chmod` checks the target but before acting, the `chmod` operation will be performed on the file the symbolic link points to. This issue can bypass directory restrictions and lead to unauthorized permission changes on the filesystem.
7.8 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Moderate
A flaw was found in the `crypto/tls` package within the Go (golang) standard library, specifically affecting TLS 1.3 connections. A remote attacker can exploit this vulnerability by sending multiple key update messages in a single record after the handshake. This can cause the connection to deadlock, leading to uncontrolled consumption of resources and ultimately a denial of service (DoS).
7.5 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Important
A flaw was found in the `crypto/x509` package within Go (golang). When verifying a certificate chain, excluded DNS (Domain Name System) constraints are not correctly applied to wildcard DNS Subject Alternative Names (SANs) if the case of the SAN differs from the constraint. This oversight could allow an attacker to bypass certificate validation, potentially leading to the acceptance of a malicious certificate that should have been rejected. This issue specifically impacts the validation of trusted certificate chains.
8.8 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Important
A flaw was found in the `encoding/asn1` package in Go. An attacker could provide a specially crafted, deeply-nested Abstract Syntax Notation One (ASN.1) structure, leading to excessive recursion during the `Unmarshal` operation. This could result in stack exhaustion and a Denial of Service (DoS) condition.
7.5 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Important
A flaw was found in the `net/mail` package of the Go programming language. An attacker could provide specially crafted inputs to the `ParseAddress`, `ParseAddressList`, or `ParseDate` functions. This could lead to excessive consumption of CPU and memory resources, resulting in a Denial of Service (DoS) for applications processing these inputs.
7.5 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Important
A flaw was found in golang.org/x/net/idna. ToASCII and ToUnicode incorrectly accept Punycode-encoded labels that decode to an ASCII-only hostname (for example, xn--example-.com returns example.com instead of an error). Applications that validate the ASCII form then convert to Unicode may grant access to a restricted hostname the ASCII check would have rejected.
8.2 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Important
A flaw was found in the `net/mail` package within the Go standard library. A remote attacker could provide specially crafted, pathological email addresses. When these malformed email addresses are parsed by the `consumePhrase` function, it can lead to excessive resource consumption due to quadratic string concatenation, resulting in a Denial of Service (DoS) condition.
7.5 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Important
A flaw was found in the Golang MIME (Multipurpose Internet Mail Extensions) package. A remote attacker could exploit this vulnerability by sending a maliciously-crafted MIME header containing many invalid encoded-words. This could lead to excessive CPU consumption, resulting in a Denial of Service (DoS) for the affected system.
7.5 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Important
A flaw was found in the `net/http` component of the Go standard library. When a server is configured to support unencrypted HTTP/2, it reads initial bytes from new connections to detect the HTTP/2 client preface. However, the `ReadHeaderTimeout` is not correctly applied during this process. This oversight could allow a remote attacker to maintain open connections indefinitely, potentially leading to a Denial of Service (DoS) by exhausting server resources.
7.5 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Important
A flaw was found in the `html/template` component of Go (golang). Pathological inputs could prematurely close an unescaped forward slash ('/'), allowing an attacker to inject arbitrary content. This could lead to Cross-Site Scripting (XSS), where malicious scripts are executed in a user's browser, potentially compromising user data or actions.
8.1 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Important
A flaw was found in the `encoding/xml` package of Go. The `DecodeElement` function failed to correctly track recursion depth, which could lead to stack exhaustion. A remote attacker could exploit this vulnerability by providing a specially crafted XML input, resulting in a Denial of Service (DoS) for the affected application.
7.5 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Important
A flaw was found in `net/url`, a component of `golang`. This vulnerability arises when resolving relative paths that contain numerous parent directory ('..') segments. A remote attacker could exploit this by providing a specially crafted path, leading to quadratic time complexity and excessive memory allocation. This can result in a Denial of Service (DoS) due to resource exhaustion.
7.5 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Important
A flaw was found in the `crypto/tls` package, part of `golang`. A malicious client can exploit this vulnerability by continuously sending KeyUpdate messages to a server. This forces the server to perform indefinite key derivation operations, leading to resource exhaustion and a Denial of Service (DoS) condition.
7.5 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Important
A flaw was found in the Go net/http package. A remote attacker can cause a Denial of Service (DoS) by sending an HTTP request containing a Range header with a large number of small byte ranges. When the server processes these ranges while serving content, it consumes an excessive amount of CPU resources, rendering the application unresponsive to legitimate users.
7.5 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Important
A flaw was found in the Go net/http package. This flaw allows a remote attacker to cause a Denial of Service (DoS) by triggering excessive CPU consumption on an affected client or server. By opening a large number of HTTP/2 streams and repeatedly sending small configuration (SETTINGS) frames that modify window sizes, an attacker forces the system into intensive state processing. This resource exhaustion degrades performance and can render the service unresponsive.
7.5 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Important
A flaw was found in the mime/multipart and net/textproto packages in Go. A remote attacker could exploit this vulnerability by submitting a crafted multipart form request that bypasses configured memory limits when the remaining boundary limit is small. This issue allows the application to read an arbitrarily long line into memory, leading to excessive resource consumption and a Denial of Service (DoS).
7.5 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Moderate
A flaw was found in crypto/tls. A remote attacker can trigger this vulnerability by sending a specially crafted packet containing multiple Encrypted Client Hello (ECH) outer extension references to a server. Processing these unauthorized references leads to excessive memory consumption, causing a Denial of Service (DoS) through server crashes or unresponsiveness.
7.5 (High)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Important
A flaw was found in Go's crypto/x509 package. The certificate verification process fails to block trust in intermediate certificates associated with a compromised Certificate Authority (CA). A remote attacker presenting a certificate signed by these intermediate authorities can impersonate legitimate servers during secure connections. This flaw can enable an attacker to conduct a man-in-the-middle (MitM) attack to intercept or alter confidential communications.
6.8 (Medium)
Affected products
Fixed
8 products, the same list as for
CVE-2024-45336
Threats
Impact
Important
References
201 references
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"title": "Vulnerability description"
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{
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"text": "golang: net/http: net/http: sensitive headers incorrectly sent after cross-domain redirect",
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},
{
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"text": "Moderate impact: Red Hat products that include the affected golang net/http client are affected by a credential-disclosure flaw in HTTP redirect handling. When a client request with a sensitive header such as Authorization is redirected from one domain to another and then to a same-domain URL, the client can incorrectly restore and send that header to the final destination, potentially exposing credentials and other sensitive information. The current Red Hat scope contains affected entries across Red Hat Enterprise Linux, OpenShift Container Platform, and other Red Hat products and components; some affect records have a current NOTAFFECTED resolution, indicating those specific product/version records are not affected, but the record provides no technical justification for why. For affected entries marked DELEGATED, a fix is being pursued by the responsible product teams. For entries marked DEFER, the record does not establish a product-specific reason for deferral; the residual risk is that applications using the affected net/http client can still disclose sensitive headers through this redirect sequence. Red Hat\u0027s CVSS is 5.9 Moderate (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N), compared with CISA\u0027s 6.1 Moderate, reflecting Red Hat\u0027s higher attack-complexity and unchanged-scope assessment and confidentiality-only impact.",
"title": "Statement"
},
{
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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"ids": [
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{
"category": "description",
"text": "A flaw was found in the Golang crypto/internal/nistec package. Due to the usage of a variable time instruction in the assembly implementation of an internal function, a small number of bits of secret scalars are leaked on the ppc64le architecture. Considering how this function is used, this leakage is likely insufficient to recover the private key when P-256 is used in any well-known protocols.",
"title": "Vulnerability description"
},
{
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"text": "crypto/internal/nistec: golang: Timing sidechannel for P-256 on ppc64le in crypto/internal/nistec",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Moderate impact: Red Hat product builds using the Golang crypto/internal/nistec component on ppc64le are exposed to a timing side channel. A variable-time instruction in an internal assembly function leaks a small number of bits of secret scalars; given how the function is used, the leakage is likely insufficient to recover a private key when P-256 is used in well-known protocols. The current affects cover Red Hat Enterprise Linux, OpenShift Container Platform, and other Red Hat products, while entries resolved as Not a Bug, Obsolete, or delegated NOTAFFECTED are outside the actionable affected scope. For the DEFER entries, remediation is deferred because the leakage is not believed sufficient for private-key recovery in those protocols; the residual risk is limited scalar-bit leakage on ppc64le. For DELEGATED entries, the same Moderate impact is being handled by the relevant product teams, with a fix being pursued. Red Hat\u0027s CVSS is 5.3 Moderate with a network attack vector, compared with CISA\u0027s 4.0 Moderate local-vector assessment.",
"title": "Statement"
},
{
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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{
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"category": "description",
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{
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
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"title": "crypto/tls: golang: crypto/tls: Denial of Service via multiple ECH outer extension references"
},
{
"cve": "CVE-2026-111943",
"cwe": {
"id": "CWE-295",
"name": "Improper Certificate Validation"
},
"discovery_date": "2026-10-20T09:38:36.160000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2556068"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Go\u0027s crypto/x509 package. The certificate verification process fails to block trust in intermediate certificates associated with a compromised Certificate Authority (CA). A remote attacker presenting a certificate signed by these intermediate authorities can impersonate legitimate servers during secure connections. This flaw can enable an attacker to conduct a man-in-the-middle (MitM) attack to intercept or alter confidential communications.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "crypto/x509: golang: crypto/x509: Man-in-the-middle attacks via untrusted intermediate certificates",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated Important because Go applications validating TLS certificates could accept unauthorized certificates issued by distrusted intermediate Certificate Authorities, potentially compromising the integrity and confidentiality of secure network communications. Any Go-based client or server relying on standard certificate verification may be exposed to man-in-the-middle attacks if an attacker intercepts traffic using certificates derived from these intermediate keys. Exploitation requires specific network positioning and certificates generated by the untrusted intermediate authorities, limiting opportunistic widespread abuse.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"category": "external",
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{
"category": "external",
"summary": "RHSB-2026-012",
"url": "https://access.redhat.com/security/vulnerabilities/RHSB-2026-012"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-111943",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-111943"
},
{
"category": "external",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111943"
},
{
"category": "external",
"summary": "https://github.com/golang/go/issues/82345",
"url": "https://github.com/golang/go/issues/82345"
},
{
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"summary": "https://groups.google.com/g/golang-nuts/c/K22sG2AYnKU",
"url": "https://groups.google.com/g/golang-nuts/c/K22sG2AYnKU"
}
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"release_date": "2026-10-20T02:00:00+00:00",
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"date": "2026-10-22T17:14:30+00:00",
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"title": "crypto/x509: golang: crypto/x509: Man-in-the-middle attacks via untrusted intermediate certificates"
}
]
}
Loading…
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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
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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.
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.
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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.