CVE-2026-34743XZ Utils provide a general-purpose data-compression library plus command-line tools.
Updated under an hour ago ()
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It affects tukaani xz. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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XZ Utils provide a general-purpose data-compression library plus command-line tools. Prior to version 5.8.3, if lzma_index_decoder() was used to decode an Index that contained no Records, the resulting lzma_index was left in a state where where a subsequent lzma_index_append() would allocate too little memory, and a buffer overflow would occur. This issue has been patched in version 5.8.3.
- CVSS
- 5.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weakness (CWE)
- CWE-122
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
tukaani xz tukaani:xz | before 5.8.3 | NVD |
References
- https://github.com/tukaani-project/xz/commit/c8c22869e780ff57c96b46939c3d79ff99395f87patch
- https://github.com/tukaani-project/xz/releases/tag/v5.8.3product, release-notes
- https://github.com/tukaani-project/xz/security/advisories/GHSA-x872-m794-cxhvvendor-advisory
- http://www.openwall.com/lists/oss-security/2026/03/31/13mailing-list, patch, third-party-advisory
- https://lists.debian.org/debian-lts-announce/2026/07/msg00034.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.