CVE-2026-71267

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{"bugzilla": {"description": "microtar: microtar: Stack buffer overflow via overly long filenames", "id": "2511585", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511585"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-120", "details": ["A flaw was found in microtar. The mtar_write_file_header() and mtar_write_dir_header()\nfunctions copy a caller-supplied entry name into a fixed 100-byte stack buffer using\nstrcpy() without validating the name length. An application that archives an\nattacker-controlled or externally supplied filename longer than 99 characters can\ntrigger a stack buffer overflow, which could lead to arbitrary code execution or\ndenial of service."], "mitigation": {"lang": "en:us", "value": "No practical library-level workaround or fixed upstream release is published;\nall versions are reported affected. Applications that embed microtar should\nreject or truncate entry names to fewer than 100 bytes before calling\nmtar_write_file_header() / mtar_write_dir_header(), or replace microtar with a\nmaintained tar implementation. Until a patched microtar is available, avoid\narchiving untrusted or attacker-controlled filenames with this library."}, "name": "CVE-2026-71267", "public_date": "2026-08-05T12:26:14Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-71267\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-71267\nhttps://github.com/rxi/microtar\nhttps://github.com/rxi/microtar/blob/master/src/microtar.c"], "statement": "This Important flaw in microtar allows a stack buffer overflow when applications process externally-influenced filenames exceeding 99 characters. Exploitation could lead to a denial of service or potentially arbitrary code execution if an application using microtar archives attacker-controlled input without proper validation.\nRed Hat rates this issue with User Interaction Required (UI:R). Exploitation depends on an application using microtar to archive a caller-supplied entry name longer than 99 characters. That path typically needs a user or application action that supplies the filename, rather than a fully automated remote attack with no interaction. The CNA assessment uses UI:N; Red Hat's score reflects this precondition.", "threat_severity": "Important"}

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