High severity7.4NVD Advisory· Published Mar 13, 2026· Updated Jun 11, 2026
CVE-2025-71263
CVE-2025-71263
Description
In UNIX Fourth Research Edition (v4), the su command is vulnerable to a buffer overflow due to the 'password' variable having a fixed size of 100 bytes. A local user can exploit this to gain root privileges. It is unlikely that UNIX v4 is running anywhere outside of a very small number of lab environments. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3- cpe:2.3:o:opengroup:unix:4:*:*:*:*:*:*:*
- Range: v4
Patches
Vulnerability mechanics
References
6- www.openwall.com/lists/oss-security/2026/03/20/6nvdIssue TrackingMailing List
- www.openwall.com/lists/oss-security/2026/03/21/4nvdIssue TrackingMailing List
- discuss.systems/@ricci/115747843169814700nvdIssue Tracking
- sigma-star.at/blog/2025/12/unix-v4-buffer-overflow/nvdPress/Media Coverage
- www.spinellis.gr/blog/20251223/nvdTechnical Description
- www.tuhs.org/pipermail/tuhs/2026-January/032991.htmlnvdIssue TrackingMailing List
News mentions
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