Vulnerability-Lookup

OPENSUSE-SU-2026:21867-1

Vulnerability from csaf_opensuse - Published: 2026-09-16 16:27 - Updated: 2026-09-17 17:44

Summary

Security update for mkvtoolnix

Severity

Important

Notes

Title of the patch: Security update for mkvtoolnix

Description of the patch: This update for mkvtoolnix fixes the following issues: Changes in mkvtoolnix: - CVE-2026-90783: heap buffer overflow in the bundled avilib library's ODML superindex parser due to integer wraparound in 32-bit arithmetic (boo#1280126).

Patchnames: openSUSE-Leap-16.0-packagehub-599

CVE-2026-90783

Affected products

Recommended 12 products

Product	Version	Remediation
Unresolved product id: openSUSE Leap 16.0:mkvtoolnix-0:95.0-bp160.2.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:mkvtoolnix-0:95.0-bp160.2.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:mkvtoolnix-0:95.0-bp160.2.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:mkvtoolnix-0:95.0-bp160.2.1.x86_64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:mkvtoolnix-gui-0:95.0-bp160.2.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:mkvtoolnix-gui-0:95.0-bp160.2.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:mkvtoolnix-gui-0:95.0-bp160.2.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:mkvtoolnix-gui-0:95.0-bp160.2.1.x86_64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:mkvtoolnix-tools-0:95.0-bp160.2.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:mkvtoolnix-tools-0:95.0-bp160.2.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:mkvtoolnix-tools-0:95.0-bp160.2.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:mkvtoolnix-tools-0:95.0-bp160.2.1.x86_64	—	Vendor Fix

Threats

Impact important

References

6 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/o…	self
https://bugzilla.suse.com/1280126	self
https://www.suse.com/security/cve/CVE-2026-90783/	self
https://www.suse.com/security/cve/CVE-2026-90783	external
https://bugzilla.suse.com/1280126	external

JSON

To clipboard

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          "text": "MKVToolNix through 101.0 contains a heap buffer overflow in the bundled avilib library\u0027s ODML superindex parser due to integer wraparound in 32-bit arithmetic. Attackers can craft a malicious AVI file with oversized entry counts that cause an undersized heap allocation, allowing a heap buffer overflow when the file is parsed with mkvmerge.",
          "title": "CVE description"
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  ]
}

CVE-2026-90783 (GCVE-0-2026-90783)

Vulnerability from cvelistv5 – Published: 2026-09-13 12:22 – Updated: 2026-09-14 18:14

Title

MKVToolNix through 101.0 Heap Buffer Overflow via avilib ODML Superindex Integer Wraparound

Summary

MKVToolNix through 101.0 contains a heap buffer overflow in the bundled avilib library's ODML superindex parser due to integer wraparound in 32-bit arithmetic. Attackers can craft a malicious AVI file with oversized entry counts that cause an undersized heap allocation, allowing a heap buffer overflow when the file is parsed with mkvmerge.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

8.5 (High)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-14 17:32 UTC

CWE

CWE-680 - Integer Overflow to Buffer Overflow

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://codeberg.org/mbunkus/mkvtoolnix/commit/14…	patch
https://codeberg.org/mbunkus/mkvtoolnix/src/tag/r…	technical-description
https://codeberg.org/mbunkus/mkvtoolnix	product
https://www.vulncheck.com/advisories/mkvtoolnix-t…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
Moritz Bunkus	MKVToolNix	Affected: 0 , ≤ 101.0 (custom) Unaffected: 1495126138e086080f0163bee27fafbdf956a1d0 (git)

Date Public

2026-08-25 00:00

Credits

Tristan Madani

Show details on NVD website

JSON

To clipboard

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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.

Detection rules are retrieved from Rulezet.

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.

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.

Action not permitted

OPENSUSE-SU-2026:21867-1

CVE-2026-90783 (GCVE-0-2026-90783)

Tags

Sightings

Nomenclature

Related by attack behaviour