RHSA-2026:28235
Vulnerability from csaf_redhat - Published: 2026-06-23 18:28 - Updated: 2026-06-25 11:20Summary
Red Hat Security Advisory: libtasn1 security update
Severity
Low
Notes
Topic: An update for libtasn1 is now available for Red Hat Enterprise Linux 10.
Red Hat Product Security has rated this update as having a security impact of Low. 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: A library that provides Abstract Syntax Notation One (ASN.1, as specified by the X.680 ITU-T recommendation) parsing and structures management, and Distinguished Encoding Rules (DER, as per X.690) encoding and decoding functions.
Security Fix(es):
* libtasn1: libtasn1: Denial of Service via stack-based buffer overflow in asn1_expend_octet_string (CVE-2025-13151)
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 libtasn1. A remote attacker could exploit a stack-based buffer overflow vulnerability in the `asn1_expend_octet_string` function. This occurs due to a failure in validating the size of input data. Successful exploitation can lead to a Denial of Service (DoS) condition, making the affected system or application unavailable.
5.9 (Medium)
Affected products
Fixed
37 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:libtasn1-debuginfo-0:4.20.0-5.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-debuginfo-0:4.20.0-5.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-debuginfo-0:4.20.0-5.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-debuginfo-0:4.20.0-5.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-debugsource-0:4.20.0-5.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-debugsource-0:4.20.0-5.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-debugsource-0:4.20.0-5.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-debugsource-0:4.20.0-5.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-devel-0:4.20.0-5.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-devel-0:4.20.0-5.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-devel-0:4.20.0-5.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-devel-0:4.20.0-5.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-tools-0:4.20.0-5.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-tools-0:4.20.0-5.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-tools-0:4.20.0-5.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-tools-0:4.20.0-5.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-tools-debuginfo-0:4.20.0-5.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-tools-debuginfo-0:4.20.0-5.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-tools-debuginfo-0:4.20.0-5.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libtasn1-tools-debuginfo-0:4.20.0-5.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libtasn1-0:4.20.0-5.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libtasn1-0:4.20.0-5.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libtasn1-0:4.20.0-5.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libtasn1-0:4.20.0-5.el10_2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libtasn1-0:4.20.0-5.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libtasn1-debuginfo-0:4.20.0-5.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libtasn1-debuginfo-0:4.20.0-5.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libtasn1-debuginfo-0:4.20.0-5.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libtasn1-debuginfo-0:4.20.0-5.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libtasn1-debugsource-0:4.20.0-5.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libtasn1-debugsource-0:4.20.0-5.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libtasn1-debugsource-0:4.20.0-5.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libtasn1-debugsource-0:4.20.0-5.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libtasn1-tools-debuginfo-0:4.20.0-5.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libtasn1-tools-debuginfo-0:4.20.0-5.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libtasn1-tools-debuginfo-0:4.20.0-5.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libtasn1-tools-debuginfo-0:4.20.0-5.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Low
References
10 references
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"text": "A flaw was found in libtasn1. A remote attacker could exploit a stack-based buffer overflow vulnerability in the `asn1_expend_octet_string` function. This occurs due to a failure in validating the size of input data. Successful exploitation can lead to a Denial of Service (DoS) condition, making the affected system or application unavailable.",
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{
"category": "summary",
"text": "libtasn1: libtasn1: Denial of Service via stack-based buffer overflow in asn1_expend_octet_string",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated Low for Red Hat products. A stack-based buffer overflow in the `libtasn1` library, specifically within the `asn1_expend_octet_string` function, can be triggered by failing to validate input data size. This could allow a remote, unauthenticated attacker to cause a denial of service in applications utilizing `libtasn1`.",
"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-2025-13151"
},
{
"category": "external",
"summary": "RHBZ#2427698",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2427698"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-13151",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-13151"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-13151",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-13151"
},
{
"category": "external",
"summary": "https://gitlab.com/gnutls/libtasn1",
"url": "https://gitlab.com/gnutls/libtasn1"
},
{
"category": "external",
"summary": "https://gitlab.com/gnutls/libtasn1/-/merge_requests/121",
"url": "https://gitlab.com/gnutls/libtasn1/-/merge_requests/121"
}
],
"release_date": "2026-01-07T21:14:05.223000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-23T18:28:54+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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},
"url": "https://access.redhat.com/errata/RHSA-2026:28235"
},
{
"category": "workaround",
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
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],
"threats": [
{
"category": "impact",
"details": "Low"
}
],
"title": "libtasn1: libtasn1: Denial of Service via stack-based buffer overflow in asn1_expend_octet_string"
}
]
}
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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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