OPENSUSE-SU-2026:21945-1
Vulnerability from csaf_opensuse - Published: 2026-09-24 07:03 - Updated: 2026-09-25 16:51Summary
Security update for expat
Severity
Important
Notes
Title of the patch: Security update for expat
Description of the patch: This update for expat fixes the following issues:
- CVE-2026-41080: crafted XML document can cause a denial of service (bsc#1262263).
- CVE-2026-45186: In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a
denial of service via moderately sized crafted XML input (bsc#1264713).
- CVE-2026-50219: libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse,
XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation (bsc#1267631).
- CVE-2026-56131: libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within
handlers in cases of a policy violation (bsc#1268572).
- CVE-2026-56132: mishandled memory reallocation during array scaffolding in doProlog can cause heap-based buffer
overflows (bsc#1268573).
- CVE-2026-56403: integer overflow in the storeAtts function can cause memory corruption and potential arbitrary code
execution (bsc#1275096).
- CVE-2026-56404: integer overflow in the addBinding function can cause undersized memory allocations, memory
corruption, and application crashes (bsc#1275096).
- CVE-2026-56405: integer overflow in the getAttributeId function can cause heap memory corruption and arbitrary
code execution (bsc#1275096).
- CVE-2026-56406: missing bounds validation in XML_ParseBuffer can cause integer overflows, memory corruption, and
application crashes (bsc#1275096).
- CVE-2026-56407: integer overflow in doProlog related to entity text length can cause memory corruption and denial
of service (bsc#1275096).
- CVE-2026-56408: integer overflow in the copyString function can cause heap memory corruption and application crashes
(bsc#1275096).
- CVE-2026-56409: integer overflow in the xmlwf utility output filename handling can allow path buffer corruption and
arbitrary file write conditions (bsc#1275096).
- CVE-2026-56410: integer overflow in resolveSystemId within the xmlwf utility can cause memory corruption, information
disclosure, and potential code execution (bsc#1275096).
- CVE-2026-56411: integer overflow in endDoctypeDecl via NOTATION declarations in xmlwf can cause memory corruption and
denial of service (bsc#1275096).
- CVE-2026-56412: incomplete handler call depth tracking in doCdataSection can cause use-after-free
conditions and arbitrary code execution (bsc#1275096).
- CVE-2026-66046: libexpat: denial of service vulnerability caused by quadratic algorithmic complexity in the
storeAtts() function in xmlparse.c (bsc#1275732).
- CVE-2026-72522: libexpat: out-of-bounds read and resultant infinite loop due to low surrogates being treated the same
as high surrogates during Unicode processing (bsc#1275594).
- CVE-2026-76641: Expat through 2.8.3 contains an out-of-bounds read vulnerability that allows attackers to trigger
memory corruption (bsc#1275915).
- CVE-2026-76956: In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to
insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via
crafted X (bsc#1275860).
- CVE-2026-76957: libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. (bsc#1275859).
Changes for expat:
- Updated to version 2.8.4
Patchnames: openSUSE-Leap-16.0-1754
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
Affected products
Recommended
12 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: openSUSE Leap 16.0:expat-0:2.8.4-160000.1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:expat-0:2.8.4-160000.1.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:expat-0:2.8.4-160000.1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:expat-0:2.8.4-160000.1.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:libexpat-devel-0:2.8.4-160000.1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:libexpat-devel-0:2.8.4-160000.1.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:libexpat-devel-0:2.8.4-160000.1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:libexpat-devel-0:2.8.4-160000.1.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:libexpat1-0:2.8.4-160000.1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:libexpat1-0:2.8.4-160000.1.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:libexpat1-0:2.8.4-160000.1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:libexpat1-0:2.8.4-160000.1.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
low
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
low
4.9 (Medium)
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
moderate
4.9 (Medium)
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
moderate
6.9 (Medium)
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
moderate
6.9 (Medium)
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
moderate
6.9 (Medium)
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
moderate
6.9 (Medium)
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
moderate
6.9 (Medium)
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
moderate
6.9 (Medium)
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
moderate
6.9 (Medium)
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
moderate
4.5 (Medium)
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
moderate
6.3 (Medium)
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
moderate
6.9 (Medium)
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
moderate
4.9 (Medium)
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
moderate
7.5 (High)
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
important
7.5 (High)
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
important
7.5 (High)
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
important
7.5 (High)
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
important
4.9 (Medium)
Affected products
Recommended
12 products, the same list as for
CVE-2026-41080
Threats
Impact
moderate
References
88 references
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},
{
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{
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"baseSeverity": "MEDIUM",
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"threats": [
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"date": "2026-09-24T07:03:56Z",
"details": "moderate"
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"title": "CVE-2026-76957"
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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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