RHSA-2026:54869
Vulnerability from csaf_redhat - Published: 2026-08-14 14:53 - Updated: 2026-08-16 00:18Summary
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:
expat:
* expat-2.8.3-0.1.hum1 (aarch64, x86_64)
* expat-devel-2.8.3-0.1.hum1 (aarch64, x86_64)
* expat-static-2.8.3-0.1.hum1 (aarch64, x86_64)
* expat-2.8.3-0.1.hum1.src (src)
Security Fix(es):
expat:
* CVE-2026-72522
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 in libexpat's _toUtf16 functions mishandles Unicode low surrogates by treating them as high surrogates. An attacker can exploit the resulting out-of-bounds read to trigger an infinite loop, causing a denial of service (DoS).
6.2 (Medium)
Affected products
Fixed
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:expat-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:expat-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:expat-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
References
11 references
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"text": "This update includes the following RPMs:\n\nexpat:\n * expat-2.8.3-0.1.hum1 (aarch64, x86_64)\n * expat-devel-2.8.3-0.1.hum1 (aarch64, x86_64)\n * expat-static-2.8.3-0.1.hum1 (aarch64, x86_64)\n * expat-2.8.3-0.1.hum1.src (src)\n\nSecurity Fix(es):\n\nexpat:\n * CVE-2026-72522",
"title": "Details"
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"url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_54869.json"
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"title": "Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update",
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"vulnerabilities": [
{
"cve": "CVE-2026-72522",
"cwe": {
"id": "CWE-125",
"name": "Out-of-bounds Read"
},
"discovery_date": "2026-08-10T03:50:50.160938+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2513021"
}
],
"notes": [
{
"category": "description",
"text": "A flaw in libexpat\u0027s _toUtf16 functions mishandles Unicode low surrogates by treating them as high surrogates. An attacker can exploit the resulting out-of-bounds read to trigger an infinite loop, causing a denial of service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "expat: libexpat: Denial of Service due to incorrect Unicode surrogate handling",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A denial of service (DoS) flaw was found in libexpat\u0027s handling of Unicode surrogate pairs. An attacker providing specially crafted XML input to an application parsing untrusted data can trigger an out-of-bounds read and an infinite loop, leading to high CPU usage and system resource exhaustion.",
"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:expat-main@aarch64",
"Red Hat Hardened Images:expat-main@src",
"Red Hat Hardened Images:expat-main@x86_64"
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"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-72522"
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{
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"summary": "RHBZ#2513021",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513021"
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{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-72522",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-72522"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-72522",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72522"
},
{
"category": "external",
"summary": "https://bugzilla.mozilla.org/show_bug.cgi?id=2053153",
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2053153"
},
{
"category": "external",
"summary": "https://github.com/libexpat/libexpat/pull/1296",
"url": "https://github.com/libexpat/libexpat/pull/1296"
}
],
"release_date": "2026-08-10T03:28:04.274000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-08-14T14:53:25+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:expat-main@aarch64",
"Red Hat Hardened Images:expat-main@src",
"Red Hat Hardened Images:expat-main@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:54869"
},
{
"category": "workaround",
"details": "Limit exposure by restricting the parsing of untrusted or unverified XML inputs, and validate incoming XML documents for malformed character sequences before processing. Additionally, enforce process-level CPU resource limits and parsing timeouts to prevent system-wide Denial of Service from infinite parsing loops.",
"product_ids": [
"Red Hat Hardened Images:expat-main@aarch64",
"Red Hat Hardened Images:expat-main@src",
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 6.2,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:expat-main@aarch64",
"Red Hat Hardened Images:expat-main@src",
"Red Hat Hardened Images:expat-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "expat: libexpat: Denial of Service due to incorrect Unicode surrogate handling"
}
]
}
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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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