RHSA-2026:57604
Vulnerability from csaf_redhat - Published: 2026-08-20 16:27 - Updated: 2026-09-24 12:20Summary
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:
libxml2:
* libxml2-16-2.15.3-0.1.3.hum1 (aarch64, x86_64)
* libxml2-2.15.3-0.1.3.hum1 (aarch64, x86_64)
* libxml2-devel-2.15.3-0.1.3.hum1 (aarch64, x86_64)
* libxml2-static-2.15.3-0.1.3.hum1 (aarch64, x86_64)
* python3-libxml2-2.15.3-0.1.3.hum1 (aarch64, x86_64)
* libxml2-2.15.3-0.1.3.hum1.src (src)
Security Fix(es):
libxml2:
* CVE-2026-76781
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 libxml2. A local user or an attacker providing a specially crafted XML catalog can trigger a NULL pointer dereference during XML catalog parsing. This occurs when a `nextCatalog` element lacks its mandatory `catalog` attribute, leading to the application crashing and causing a Denial of Service (DoS).
5.5 (Medium)
Affected products
Fixed
11 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:libxml2-0:2.15.3-0.1.3.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libxml2-0:2.15.3-0.1.3.hum1@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libxml2-0:2.15.3-0.1.3.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libxml2-16-0:2.15.3-0.1.3.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libxml2-16-0:2.15.3-0.1.3.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libxml2-devel-0:2.15.3-0.1.3.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libxml2-devel-0:2.15.3-0.1.3.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libxml2-static-0:2.15.3-0.1.3.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libxml2-static-0:2.15.3-0.1.3.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3-libxml2-0:2.15.3-0.1.3.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:python3-libxml2-0:2.15.3-0.1.3.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
References
11 references
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"vulnerabilities": [
{
"acknowledgments": [
{
"names": [
"Yirou Yang"
]
}
],
"cve": "CVE-2026-76781",
"cwe": {
"id": "CWE-476",
"name": "NULL Pointer Dereference"
},
"discovery_date": "2026-08-19T17:05:04.484000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2519776"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in libxml2. A local user or an attacker providing a specially crafted XML catalog can trigger a NULL pointer dereference during XML catalog parsing. This occurs when a `nextCatalog` element lacks its mandatory `catalog` attribute, leading to the application crashing and causing a Denial of Service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libxml2: libxml2: NULL pointer dereference parsing nextCatalog without catalog attribute",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Moderate flaw in libxml2\u0027s XML catalog parsing can lead to a denial of service. The vulnerability requires user interaction, as a specially crafted XML catalog with a missing `catalog` attribute in a `nextCatalog` element must be processed by an application using libxml2, causing it to crash. This limits the attack surface to scenarios where an attacker can provide malicious XML input to a vulnerable application.",
"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": {
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2519776"
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"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-76781",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76781"
},
{
"category": "external",
"summary": "https://gitlab.gnome.org/GNOME/libxml2/-/commit/c6324894",
"url": "https://gitlab.gnome.org/GNOME/libxml2/-/commit/c6324894"
},
{
"category": "external",
"summary": "https://gitlab.gnome.org/GNOME/libxml2/-/merge_requests/442",
"url": "https://gitlab.gnome.org/GNOME/libxml2/-/merge_requests/442"
}
],
"release_date": "2026-08-19T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-08-20T16:27:46+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:libxml2-0:2.15.3-0.1.3.hum1@aarch64",
"Red Hat Hardened Images:libxml2-0:2.15.3-0.1.3.hum1@src",
"Red Hat Hardened Images:libxml2-0:2.15.3-0.1.3.hum1@x86_64",
"Red Hat Hardened Images:libxml2-16-0:2.15.3-0.1.3.hum1@aarch64",
"Red Hat Hardened Images:libxml2-16-0:2.15.3-0.1.3.hum1@x86_64",
"Red Hat Hardened Images:libxml2-devel-0:2.15.3-0.1.3.hum1@aarch64",
"Red Hat Hardened Images:libxml2-devel-0:2.15.3-0.1.3.hum1@x86_64",
"Red Hat Hardened Images:libxml2-static-0:2.15.3-0.1.3.hum1@aarch64",
"Red Hat Hardened Images:libxml2-static-0:2.15.3-0.1.3.hum1@x86_64",
"Red Hat Hardened Images:python3-libxml2-0:2.15.3-0.1.3.hum1@aarch64",
"Red Hat Hardened Images:python3-libxml2-0:2.15.3-0.1.3.hum1@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:57604"
},
{
"category": "workaround",
"details": "To mitigate this issue, avoid processing untrusted XML catalog files with applications linked against libxml2. Users should exercise caution when opening or processing XML documents from untrusted sources, as a malicious catalog could lead to application crashes. Where possible, restrict the ability of applications to load external XML catalogs, or ensure that only trusted catalog files are used.",
"product_ids": [
"Red Hat Hardened Images:libxml2-0:2.15.3-0.1.3.hum1@aarch64",
"Red Hat Hardened Images:libxml2-0:2.15.3-0.1.3.hum1@src",
"Red Hat Hardened Images:libxml2-0:2.15.3-0.1.3.hum1@x86_64",
"Red Hat Hardened Images:libxml2-16-0:2.15.3-0.1.3.hum1@aarch64",
"Red Hat Hardened Images:libxml2-16-0:2.15.3-0.1.3.hum1@x86_64",
"Red Hat Hardened Images:libxml2-devel-0:2.15.3-0.1.3.hum1@aarch64",
"Red Hat Hardened Images:libxml2-devel-0:2.15.3-0.1.3.hum1@x86_64",
"Red Hat Hardened Images:libxml2-static-0:2.15.3-0.1.3.hum1@aarch64",
"Red Hat Hardened Images:libxml2-static-0:2.15.3-0.1.3.hum1@x86_64",
"Red Hat Hardened Images:python3-libxml2-0:2.15.3-0.1.3.hum1@aarch64",
"Red Hat Hardened Images:python3-libxml2-0:2.15.3-0.1.3.hum1@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:libxml2-0:2.15.3-0.1.3.hum1@aarch64",
"Red Hat Hardened Images:libxml2-0:2.15.3-0.1.3.hum1@src",
"Red Hat Hardened Images:libxml2-0:2.15.3-0.1.3.hum1@x86_64",
"Red Hat Hardened Images:libxml2-16-0:2.15.3-0.1.3.hum1@aarch64",
"Red Hat Hardened Images:libxml2-16-0:2.15.3-0.1.3.hum1@x86_64",
"Red Hat Hardened Images:libxml2-devel-0:2.15.3-0.1.3.hum1@aarch64",
"Red Hat Hardened Images:libxml2-devel-0:2.15.3-0.1.3.hum1@x86_64",
"Red Hat Hardened Images:libxml2-static-0:2.15.3-0.1.3.hum1@aarch64",
"Red Hat Hardened Images:libxml2-static-0:2.15.3-0.1.3.hum1@x86_64",
"Red Hat Hardened Images:python3-libxml2-0:2.15.3-0.1.3.hum1@aarch64",
"Red Hat Hardened Images:python3-libxml2-0:2.15.3-0.1.3.hum1@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "libxml2: libxml2: NULL pointer dereference parsing nextCatalog without catalog attribute"
}
]
}
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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