RHSA-2026:60451
Vulnerability from csaf_redhat - Published: 2026-08-27 09:03 - Updated: 2026-08-27 14:47Summary
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-2.8.3-0.1.1.hum1 (aarch64, x86_64)
* expat-devel-2.8.3-0.1.1.hum1 (aarch64, x86_64)
* expat-static-2.8.3-0.1.1.hum1 (aarch64, x86_64)
* expat-2.8.3-0.1.1.hum1.src (src)
Security Fix(es):
expat:
* CVE-2026-76956
* CVE-2026-76957
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 libexpat. This vulnerability arises from the software misinterpreting a return code, leading to insufficient randomness (entropy) for hash functions. A remote attacker could exploit this by sending specially crafted XML content, triggering hash flooding attacks. This can result in a denial of service (DoS), making the affected system or application unavailable to legitimate users.
5.9 (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
A flaw was found in libexpat. The library's handling of custom encoding callbacks lacks proper tracking of handler call depth, which can lead to a use-after-free vulnerability. This memory corruption flaw could allow a local attacker to cause a denial of service or potentially execute arbitrary code.
4.9 (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
17 references
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"text": "This update includes the following RPMs:\n\nexpat:\n * expat-2.8.3-0.1.1.hum1 (aarch64, x86_64)\n * expat-devel-2.8.3-0.1.1.hum1 (aarch64, x86_64)\n * expat-static-2.8.3-0.1.1.hum1 (aarch64, x86_64)\n * expat-2.8.3-0.1.1.hum1.src (src)\n\nSecurity Fix(es):\n\nexpat:\n * CVE-2026-76956\n * CVE-2026-76957",
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"vulnerabilities": [
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"cwe": {
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"name": "Insufficient Entropy"
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"ids": [
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"notes": [
{
"category": "description",
"text": "A flaw was found in libexpat. This vulnerability arises from the software misinterpreting a return code, leading to insufficient randomness (entropy) for hash functions. A remote attacker could exploit this by sending specially crafted XML content, triggering hash flooding attacks. This can result in a denial of service (DoS), making the affected system or application unavailable to legitimate users.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libexpat: libexpat: Denial of Service via hash flooding attack with crafted XML",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat ships libexpat (packaged as \"expat\") across many products. This vulnerability was introduced in libexpat 2.8.2. Most Red Hat products ship expat versions prior to 2.8.2 and are therefore not affected. Only products shipping expat 2.8.2 or 2.8.3 are vulnerable to this hash flooding denial of service.",
"title": "Statement"
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{
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"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
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"Red Hat Hardened Images:expat-main@src",
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},
{
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76956"
},
{
"category": "external",
"summary": "https://github.com/libexpat/libexpat/pull/1326",
"url": "https://github.com/libexpat/libexpat/pull/1326"
}
],
"release_date": "2026-08-20T04:22:51.381000+00:00",
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{
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"date": "2026-08-27T09:03:03+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": [
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"Red Hat Hardened Images:expat-main@src",
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"product_ids": [
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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"products": [
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"Red Hat Hardened Images:expat-main@src",
"Red Hat Hardened Images:expat-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "libexpat: libexpat: Denial of Service via hash flooding attack with crafted XML"
},
{
"cve": "CVE-2026-76957",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"discovery_date": "2026-08-20T04:40:57.555835+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2520125"
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"notes": [
{
"category": "description",
"text": "A flaw was found in libexpat. The library\u0027s handling of custom encoding callbacks lacks proper tracking of handler call depth, which can lead to a use-after-free vulnerability. This memory corruption flaw could allow a local attacker to cause a denial of service or potentially execute arbitrary code.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libexpat: libexpat: Memory corruption vulnerability allows arbitrary code execution or denial of service",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat ships libexpat (packaged as \"expat\") across many products. All versions of expat prior to 2.8.4 are affected by this use-after-free vulnerability. Exploitation requires triggering the vulnerable code path through custom encoding callbacks, which is not a common usage pattern.",
"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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"references": [
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"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-76957"
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{
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2520125"
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-76957"
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76957"
},
{
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"summary": "https://github.com/libexpat/libexpat/pull/1322",
"url": "https://github.com/libexpat/libexpat/pull/1322"
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{
"category": "external",
"summary": "https://github.com/libexpat/libexpat/pull/1329",
"url": "https://github.com/libexpat/libexpat/pull/1329"
}
],
"release_date": "2026-08-20T04:28:04.788000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-08-27T09:03:03+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"
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{
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"product_ids": [
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"Red Hat Hardened Images:expat-main@src",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "LOW",
"baseScore": 4.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
"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": "libexpat: libexpat: Memory corruption vulnerability allows arbitrary code execution or denial of service"
}
]
}
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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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