RHSA-2026:40938
Vulnerability from csaf_redhat - Published: 2026-07-16 10:47 - Updated: 2026-08-25 16:50Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
haproxy:
* haproxy-3.0.25-0.1.1.hum1 (aarch64, x86_64)
* haproxy-3.0.25-0.1.1.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 HAProxy. An attacker can exploit a vulnerability where the software mishandles varint (variable-length integer encoding). This can cause HAProxy to enter an infinite loop or crash, leading to a denial of service for affected systems.
5.9 (Medium)
Affected products
Fixed
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:haproxy-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:haproxy-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:haproxy-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in HAProxy. This vulnerability, stemming from a missing length check in the NEW_TOKEN format, could allow a remote attacker to cause a low impact on data integrity and availability. This means an attacker might be able to subtly alter data or temporarily disrupt the service.
4.8 (Medium)
Affected products
Fixed
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:haproxy-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:haproxy-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:haproxy-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
References
17 references
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"text": "This update includes the following RPMs:\n\nhaproxy:\n * haproxy-3.0.25-0.1.1.hum1 (aarch64, x86_64)\n * haproxy-3.0.25-0.1.1.hum1.src (src)",
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"vulnerabilities": [
{
"cve": "CVE-2026-26080",
"cwe": {
"id": "CWE-835",
"name": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)"
},
"discovery_date": "2026-07-20T19:02:01.929314+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2502959"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in HAProxy. An attacker can exploit a vulnerability where the software mishandles varint (variable-length integer encoding). This can cause HAProxy to enter an infinite loop or crash, leading to a denial of service for affected systems.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "haproxy: HAProxy: Denial of Service due to mishandled varint",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "HAProxy versions 3.2.0 through 3.2.11 and 3.3.0 through 3.3.2 contain a flaw in QUIC frame parsing where a malformed, truncated varint (variable-length integer) causes the frame parser to enter an infinite loop, or in some cases crash the process, resulting in a denial of service. This issue is limited to HAProxy\u0027s QUIC transport support, which was introduced starting with the 3.2 release series.\n\nNo version of HAProxy shipped in a Red Hat product reaches the affected 3.2.x or 3.3.x release series; all Red Hat HAProxy packages predate this code. Red Hat products are therefore not affected by this issue.",
"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:haproxy-main@aarch64",
"Red Hat Hardened Images:haproxy-main@src",
"Red Hat Hardened Images:haproxy-main@x86_64"
]
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"references": [
{
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"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-26080"
},
{
"category": "external",
"summary": "RHBZ#2502959",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502959"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-26080",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-26080"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-26080",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26080"
},
{
"category": "external",
"summary": "https://git.haproxy.org/?p=haproxy-3.2.git;a=commit;h=5bb098ce8a656ec5711b4de3e4c87f12b216e7a1",
"url": "https://git.haproxy.org/?p=haproxy-3.2.git;a=commit;h=5bb098ce8a656ec5711b4de3e4c87f12b216e7a1"
},
{
"category": "external",
"summary": "https://www.haproxy.org",
"url": "https://www.haproxy.org"
}
],
"release_date": "2026-07-20T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-16T10:47:29+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:haproxy-main@aarch64",
"Red Hat Hardened Images:haproxy-main@src",
"Red Hat Hardened Images:haproxy-main@x86_64"
],
"restart_required": {
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},
"url": "https://access.redhat.com/errata/RHSA-2026:40938"
},
{
"category": "workaround",
"details": "No mitigation is required. No Red Hat product ships an affected version of HAProxy.",
"product_ids": [
"Red Hat Hardened Images:haproxy-main@aarch64",
"Red Hat Hardened Images:haproxy-main@src",
"Red Hat Hardened Images:haproxy-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:haproxy-main@aarch64",
"Red Hat Hardened Images:haproxy-main@src",
"Red Hat Hardened Images:haproxy-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "haproxy: HAProxy: Denial of Service due to mishandled varint"
},
{
"cve": "CVE-2026-26081",
"cwe": {
"id": "CWE-120",
"name": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
},
"discovery_date": "2026-07-20T19:01:17.922667+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2502945"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in HAProxy. This vulnerability, stemming from a missing length check in the NEW_TOKEN format, could allow a remote attacker to cause a low impact on data integrity and availability. This means an attacker might be able to subtly alter data or temporarily disrupt the service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "haproxy: HAProxy: Data integrity and availability vulnerability in NEW_TOKEN format",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Moderate impact vulnerability in HAProxy stems from a missing length check in the NEW_TOKEN format, which could lead to data integrity and availability issues. The high attack complexity required for exploitation reduces the immediate risk in typical Red Hat deployments.",
"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:haproxy-main@aarch64",
"Red Hat Hardened Images:haproxy-main@src",
"Red Hat Hardened Images:haproxy-main@x86_64"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-26081"
},
{
"category": "external",
"summary": "RHBZ#2502945",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502945"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-26081",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-26081"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-26081",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26081"
},
{
"category": "external",
"summary": "https://git.haproxy.org/?p=haproxy-3.2.git;a=commit;h=4765277f4f915baac2d57db63538ff0a59966deb",
"url": "https://git.haproxy.org/?p=haproxy-3.2.git;a=commit;h=4765277f4f915baac2d57db63538ff0a59966deb"
},
{
"category": "external",
"summary": "https://www.haproxy.org",
"url": "https://www.haproxy.org"
}
],
"release_date": "2026-07-20T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-16T10:47:29+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:haproxy-main@aarch64",
"Red Hat Hardened Images:haproxy-main@src",
"Red Hat Hardened Images:haproxy-main@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:40938"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
"product_ids": [
"Red Hat Hardened Images:haproxy-main@aarch64",
"Red Hat Hardened Images:haproxy-main@src",
"Red Hat Hardened Images:haproxy-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 4.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:haproxy-main@aarch64",
"Red Hat Hardened Images:haproxy-main@src",
"Red Hat Hardened Images:haproxy-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "haproxy: HAProxy: Data integrity and availability vulnerability in NEW_TOKEN format"
}
]
}
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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.
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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.
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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