RHSA-2026:13722
Vulnerability from csaf_redhat - Published: 2026-05-05 11:37 - Updated: 2026-05-05 11:40Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
fontconfig:
* fontconfig-2.17.1-0.1.hum1 (aarch64, x86_64)
* fontconfig-devel-2.17.1-0.1.hum1 (aarch64, x86_64)
* fontconfig-devel-doc-2.17.1-0.1.hum1 (noarch)
* fontconfig-2.17.1-0.1.hum1.src (src)
Security Fix(es):
fontconfig:
* CVE-2026-34085
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 fontconfig. This vulnerability, an off-by-one error in how fontconfig handles font capabilities, could allow a local attacker to cause a one-byte out-of-bounds write. This issue may lead to a system crash, resulting in a Denial of Service (DoS), or potentially enable the attacker to execute unauthorized code.
6.6 (Medium)
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-2026:13722
Workaround
Red Hat is not aware of a practical temporary workaround that fully mitigates this issue or meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
References
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"text": "This update includes the following RPMs:\n\nfontconfig:\n * fontconfig-2.17.1-0.1.hum1 (aarch64, x86_64)\n * fontconfig-devel-2.17.1-0.1.hum1 (aarch64, x86_64)\n * fontconfig-devel-doc-2.17.1-0.1.hum1 (noarch)\n * fontconfig-2.17.1-0.1.hum1.src (src)\n\nSecurity Fix(es):\n\nfontconfig:\n * CVE-2026-34085",
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"vulnerabilities": [
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"cve": "CVE-2026-34085",
"cwe": {
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"name": "Off-by-one Error"
},
"discovery_date": "2026-03-25T18:02:19.624719+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2451414"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in fontconfig. This vulnerability, an off-by-one error in how fontconfig handles font capabilities, could allow a local attacker to cause a one-byte out-of-bounds write. This issue may lead to a system crash, resulting in a Denial of Service (DoS), or potentially enable the attacker to execute unauthorized code.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "fontconfig: Fontconfig: Security flaw allows arbitrary code execution or system crash",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated Moderate severity by Red Hat Product Security. The issue arises from a memory handling flaw in font processing, which can cause applications such as fc-cache to crash when processing a specially crafted font file.\n\nExploitation requires a user to install or process a malicious font, meaning the issue cannot be triggered remotely without user interaction. While the crash may disrupt system functionality: for example, affecting graphical login services or applications that rely on font rendering, the impact is limited to application stability.\n\nThe underlying flaw involves a very small memory overwrite (one byte), which significantly limits the ability to exploit it for more serious outcomes such as executing arbitrary code or fully compromising the system. There is no evidence that the vulnerability can be reliably used to gain control over a system or access sensitive data.\n\nRed Hat therefore assesses the primary impact as a denial of service in user-space components, resulting in a Moderate severity rating.",
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"Red Hat Hardened Images:fontconfig-main@aarch64",
"Red Hat Hardened Images:fontconfig-main@noarch",
"Red Hat Hardened Images:fontconfig-main@src",
"Red Hat Hardened Images:fontconfig-main@x86_64"
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"url": "https://access.redhat.com/security/cve/CVE-2026-34085"
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451414"
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{
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"summary": "https://www.cve.org/CVERecord?id=CVE-2026-34085",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-34085"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-34085",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34085"
},
{
"category": "external",
"summary": "https://gitlab.freedesktop.org/fontconfig/fontconfig/-/commit/b9bec06d73340f1b5727302d13ac3df307b7febc",
"url": "https://gitlab.freedesktop.org/fontconfig/fontconfig/-/commit/b9bec06d73340f1b5727302d13ac3df307b7febc"
},
{
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"url": "https://gitlab.freedesktop.org/fontconfig/fontconfig/-/merge_requests/446"
},
{
"category": "external",
"summary": "https://gitlab.freedesktop.org/fontconfig/fontconfig/-/work_items/481",
"url": "https://gitlab.freedesktop.org/fontconfig/fontconfig/-/work_items/481"
}
],
"release_date": "2026-03-25T16:54:37.187000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-05T11:37:28+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/",
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"Red Hat Hardened Images:fontconfig-main@aarch64",
"Red Hat Hardened Images:fontconfig-main@noarch",
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"Red Hat Hardened Images:fontconfig-main@noarch",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 6.6,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:fontconfig-main@aarch64",
"Red Hat Hardened Images:fontconfig-main@noarch",
"Red Hat Hardened Images:fontconfig-main@src",
"Red Hat Hardened Images:fontconfig-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "fontconfig: Fontconfig: Security flaw allows arbitrary code execution or system crash"
}
]
}
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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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