rhsa-2025:11580
Vulnerability from csaf_redhat
Published
2025-07-23 05:06
Modified
2025-08-14 09:08
Summary
Red Hat Security Advisory: libxml2 security update
Notes
Topic
An update for libxml2 is now available for Red Hat Enterprise Linux 9.4 Extended Update Support.
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
The libxml2 library is a development toolbox providing the implementation of various XML standards.
Security Fix(es):
* libxml: Heap use after free (UAF) leads to Denial of service (DoS) (CVE-2025-49794)
* libxml: Type confusion leads to Denial of service (DoS) (CVE-2025-49796)
* libxml2: Integer Overflow in xmlBuildQName() Leads to Stack Buffer Overflow in libxml2 (CVE-2025-6021)
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.
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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"details": "Moderate"
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"title": "libxml2: Integer Overflow in xmlBuildQName() Leads to Stack Buffer Overflow in libxml2"
},
{
"cve": "CVE-2025-49794",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"discovery_date": "2025-06-11T21:33:43.044000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2372373"
}
],
"notes": [
{
"category": "description",
"text": "A use-after-free vulnerability was found in libxml2. This issue occurs when parsing XPath elements under certain circumstances when the XML schematron has the \u003csch:name path=\"...\"/\u003e schema elements. This flaw allows a malicious actor to craft a malicious XML document used as input for libxml, resulting in the program\u0027s crash using libxml or other possible undefined behaviors.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libxml: Heap use after free (UAF) leads to Denial of service (DoS)",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue was rated with a severity impact of Important by Red Hat Product Security, as libxml can be used to parse XML coming from the network depending on how the program consumes it and uses the library. Additionally, although the initial report shows a crash due to invalid memory access (A:H), other undefined issues that can present data integrity due to the application overwriting sensitive data are not discarded (I:H).",
"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"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-49794"
},
{
"category": "external",
"summary": "RHBZ#2372373",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2372373"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-49794",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-49794"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-49794",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-49794"
}
],
"release_date": "2025-06-10T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2025-07-23T05:06:37+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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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.1,
"baseSeverity": "CRITICAL",
"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:H",
"version": "3.1"
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{
"category": "impact",
"details": "Important"
}
],
"title": "libxml: Heap use after free (UAF) leads to Denial of service (DoS)"
},
{
"cve": "CVE-2025-49796",
"cwe": {
"id": "CWE-125",
"name": "Out-of-bounds Read"
},
"discovery_date": "2025-06-12T00:35:26.470000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2372385"
}
],
"notes": [
{
"category": "description",
"text": "A vulnerability was found in libxml2. Processing certain sch:name elements from the input XML file can trigger a memory corruption issue. This flaw allows an attacker to craft a malicious XML input file that can lead libxml to crash, resulting in a denial of service or other possible undefined behavior due to sensitive data being corrupted in memory.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libxml: Type confusion leads to Denial of service (DoS)",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "The Red Hat Product Security team has evaluated this vulnerability as having an Important security impact, as libxml can be used to parse XML from the network depending on how the program consumes it using the library. Additionally, although the initial report shows a crash due to invalid memory access (A:H), other undefined issues that can present data integrity due to the application overwriting sensitive data are not discarded (I:H).",
"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"
}
],
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{
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"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-49796"
},
{
"category": "external",
"summary": "RHBZ#2372385",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2372385"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-49796",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-49796"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-49796",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-49796"
}
],
"release_date": "2025-06-11T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2025-07-23T05:06:37+00:00",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.1,
"baseSeverity": "CRITICAL",
"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:H",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "libxml: Type confusion leads to Denial of service (DoS)"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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