RHSA-2026:9113
Vulnerability from csaf_redhat - Published: 2026-04-20 19:45 - Updated: 2026-04-23 04:31Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
ngtcp2:
* ngtcp2-1.22.1-1.hum1 (aarch64, x86_64)
* ngtcp2-crypto-gnutls-1.22.1-1.hum1 (aarch64, x86_64)
* ngtcp2-crypto-gnutls-devel-1.22.1-1.hum1 (aarch64, x86_64)
* ngtcp2-crypto-ossl-1.22.1-1.hum1 (aarch64, x86_64)
* ngtcp2-crypto-ossl-devel-1.22.1-1.hum1 (aarch64, x86_64)
* ngtcp2-devel-1.22.1-1.hum1 (aarch64, x86_64)
* ngtcp2-doc-1.22.1-1.hum1 (noarch)
* ngtcp2-1.22.1-1.hum1.src (src)
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 ngtcp2, a C implementation of the IETF QUIC (Quick UDP Internet Connections) protocol. A remote attacker can exploit a stack buffer overflow vulnerability by sending specially crafted, large transport parameters during the QUIC handshake. This occurs when the qlog callback is enabled and untrusted peer transport parameters are processed, leading to writes beyond a fixed-size buffer. This can result in a denial of service.
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:9113
Workaround
To mitigate this issue, disable the `qlog` callback in applications utilizing the ngtcp2 library. This action prevents the vulnerable code path from being exercised when processing untrusted QUIC peer transport parameters. Disabling `qlog` may impact logging and debugging capabilities. Applications linked against ngtcp2 must be restarted for the change to take effect.
References
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"cve": "CVE-2026-40170",
"cwe": {
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"name": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
},
"discovery_date": "2026-04-16T22:00:56.443931+00:00",
"ids": [
{
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"text": "2459061"
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],
"notes": [
{
"category": "description",
"text": "A flaw was found in ngtcp2, a C implementation of the IETF QUIC (Quick UDP Internet Connections) protocol. A remote attacker can exploit a stack buffer overflow vulnerability by sending specially crafted, large transport parameters during the QUIC handshake. This occurs when the qlog callback is enabled and untrusted peer transport parameters are processed, leading to writes beyond a fixed-size buffer. This can result in a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "ngtcp2: ngtcp2: Denial of service via stack buffer overflow during QUIC handshake",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Important vulnerability affects ngtcp2 when qlog is enabled and processing untrusted QUIC peer transport parameters, leading to a denial of service. In the context of Red Hat support products ngtcp2 is not shipped directly through any RPM package or supported product but is shipped as a bundled dependency by the nodejs packages to provide QUIC support. This feature is considered experimental by the NodeJS upstream and needs to be enabled during NodeJS\u0027s compilation time through (`--with-quic` configuration option), with that in mind the versions of NodeJS as shipped with Red Hat Enterprise Linux are not affected by this vulnerability as QUIC support is not enabled in the distributed supported packages. This means although the affected code is present in the package code base itself, it\u0027s not compiled when the package is built and therefore is not present in the final binary.",
"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"
}
],
"product_status": {
"fixed": [
"Red Hat Hardened Images:ngtcp2-main@aarch64",
"Red Hat Hardened Images:ngtcp2-main@noarch",
"Red Hat Hardened Images:ngtcp2-main@src",
"Red Hat Hardened Images:ngtcp2-main@x86_64"
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2459061"
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-40170"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-40170",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40170"
},
{
"category": "external",
"summary": "https://github.com/ngtcp2/ngtcp2/commit/708a7640c1f48fb8ffb540c4b8ea5b4c1dfb8ee5",
"url": "https://github.com/ngtcp2/ngtcp2/commit/708a7640c1f48fb8ffb540c4b8ea5b4c1dfb8ee5"
},
{
"category": "external",
"summary": "https://github.com/ngtcp2/ngtcp2/security/advisories/GHSA-f523-465f-8c8f",
"url": "https://github.com/ngtcp2/ngtcp2/security/advisories/GHSA-f523-465f-8c8f"
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"release_date": "2026-04-16T21:34:07.610000+00:00",
"remediations": [
{
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"date": "2026-04-20T19:45:39+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:ngtcp2-main@aarch64",
"Red Hat Hardened Images:ngtcp2-main@noarch",
"Red Hat Hardened Images:ngtcp2-main@src",
"Red Hat Hardened Images:ngtcp2-main@x86_64"
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"category": "none"
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"url": "https://access.redhat.com/errata/RHSA-2026:9113"
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{
"category": "workaround",
"details": "To mitigate this issue, disable the `qlog` callback in applications utilizing the ngtcp2 library. This action prevents the vulnerable code path from being exercised when processing untrusted QUIC peer transport parameters. Disabling `qlog` may impact logging and debugging capabilities. Applications linked against ngtcp2 must be restarted for the change to take effect.",
"product_ids": [
"Red Hat Hardened Images:ngtcp2-main@aarch64",
"Red Hat Hardened Images:ngtcp2-main@noarch",
"Red Hat Hardened Images:ngtcp2-main@src",
"Red Hat Hardened Images:ngtcp2-main@x86_64"
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"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"
},
"products": [
"Red Hat Hardened Images:ngtcp2-main@aarch64",
"Red Hat Hardened Images:ngtcp2-main@noarch",
"Red Hat Hardened Images:ngtcp2-main@src",
"Red Hat Hardened Images:ngtcp2-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "ngtcp2: ngtcp2: Denial of service via stack buffer overflow during QUIC handshake"
}
]
}
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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.
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