RHSA-2026:74001
Vulnerability from csaf_redhat - Published: 2026-09-30 17:37 - Updated: 2026-09-30 23:41Summary
Red Hat Security Advisory: expat security update
Severity
Important
Notes
Topic: An update for expat is now available for Red Hat Enterprise Linux 10.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Expat is a C library for parsing XML documents.
Security Fix(es):
* expat: Expat: Denial of Service via quadratic complexity in attribute processing (CVE-2026-66046)
* expat: Expat: XML Injection via Malformed UTF-16 Input (CVE-2026-93990)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
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 the Expat XML parsing library. A remote, unauthenticated attacker can supply a specially crafted XML document to trigger quadratic algorithmic complexity in the storeAtts() function, causing excessive CPU consumption and a denial of service
7.5 (High)
Affected products
Fixed
25 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:expat-debuginfo-0:2.7.3-1.el10_2.5.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:expat-debuginfo-0:2.7.3-1.el10_2.5.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:expat-debuginfo-0:2.7.3-1.el10_2.5.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:expat-debuginfo-0:2.7.3-1.el10_2.5.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:expat-debugsource-0:2.7.3-1.el10_2.5.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:expat-debugsource-0:2.7.3-1.el10_2.5.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:expat-debugsource-0:2.7.3-1.el10_2.5.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:expat-debugsource-0:2.7.3-1.el10_2.5.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:expat-devel-0:2.7.3-1.el10_2.5.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:expat-devel-0:2.7.3-1.el10_2.5.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:expat-devel-0:2.7.3-1.el10_2.5.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:expat-devel-0:2.7.3-1.el10_2.5.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:expat-0:2.7.3-1.el10_2.5.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:expat-0:2.7.3-1.el10_2.5.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:expat-0:2.7.3-1.el10_2.5.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:expat-0:2.7.3-1.el10_2.5.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:expat-0:2.7.3-1.el10_2.5.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:expat-debuginfo-0:2.7.3-1.el10_2.5.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:expat-debuginfo-0:2.7.3-1.el10_2.5.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:expat-debuginfo-0:2.7.3-1.el10_2.5.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:expat-debuginfo-0:2.7.3-1.el10_2.5.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:expat-debugsource-0:2.7.3-1.el10_2.5.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:expat-debugsource-0:2.7.3-1.el10_2.5.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:expat-debugsource-0:2.7.3-1.el10_2.5.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:expat-debugsource-0:2.7.3-1.el10_2.5.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
A flaw was found in Expat. This vulnerability allows a remote attacker to send specially crafted UTF-16 encoded XML data. Due to improper validation of surrogate characters, the parser can be tricked into accepting malformed sequences, which can hide legitimate markup characters. This could enable XML injection attacks, potentially leading to information disclosure or other integrity impacts.
7.5 (High)
Affected products
Fixed
25 products, the same list as for
CVE-2026-66046
Threats
Impact
Important
References
19 references
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "expat: Expat: Denial of Service via quadratic complexity in attribute processing"
},
{
"cve": "CVE-2026-93990",
"cwe": {
"id": "CWE-176",
"name": "Improper Handling of Unicode Encoding"
},
"discovery_date": "2026-09-22T21:50:24.320578+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2538967"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Expat. This vulnerability allows a remote attacker to send specially crafted UTF-16 encoded XML data. Due to improper validation of surrogate characters, the parser can be tricked into accepting malformed sequences, which can hide legitimate markup characters. This could enable XML injection attacks, potentially leading to information disclosure or other integrity impacts.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "expat: Expat: XML Injection via Malformed UTF-16 Input",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important flaw in Expat, which can lead to XML injection. The vulnerability arises from improper validation of UTF-16 surrogate pairs, allowing attackers to craft malformed XML that can bypass parser security checks. This could result in data integrity compromise in applications processing untrusted XML input.",
"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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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-93990"
},
{
"category": "external",
"summary": "RHBZ#2538967",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2538967"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-93990",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-93990"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-93990",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93990"
},
{
"category": "external",
"summary": "https://github.com/libexpat/libexpat",
"url": "https://github.com/libexpat/libexpat"
},
{
"category": "external",
"summary": "https://github.com/libexpat/libexpat/commit/ff6e1d7e750bbe245178f51a47a965dc8342861a",
"url": "https://github.com/libexpat/libexpat/commit/ff6e1d7e750bbe245178f51a47a965dc8342861a"
},
{
"category": "external",
"summary": "https://github.com/libexpat/libexpat/pull/1282",
"url": "https://github.com/libexpat/libexpat/pull/1282"
},
{
"category": "external",
"summary": "https://www.vulncheck.com/advisories/expat-through-2.8.4-malformed-utf-16-acceptance-via-unchecked-surrogate",
"url": "https://www.vulncheck.com/advisories/expat-through-2.8.4-malformed-utf-16-acceptance-via-unchecked-surrogate"
}
],
"release_date": "2026-09-19T22:58:11.224000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-30T17:37:54+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:74001"
},
{
"category": "workaround",
"details": "To mitigate this restrict which hosts can send XML (including UTF-16) to Expat-based services with a host firewall and network segmentation. Where applications allow, prefer UTF-8-only input and reject unexpected encodings.",
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"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
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}
],
"title": "expat: Expat: XML Injection via Malformed UTF-16 Input"
}
]
}
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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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