CVE-2026-111146

CVSS 6.9 (medium) · published 2026-10-15

ytnef through 2.1.2 contains a heap out-of-bounds read vulnerability in MAPIPrint() that allows attackers to read past heap allocations by supplying compressed RTF properties. Attackers can deliver a crafted winmail.dat whose decompressed RTF lacks a NUL terminator, causing printf to over-read, crashing ytnefprint and leaking adjacent heap bytes.

Weakness: CWE-125

Source: NVD CVE-2026-111146

References

• https://github.com/Yeraze/ytnef
• https://github.com/Yeraze/ytnef/blob/d9f089144414d3b0912c29ab96f8f1c591d00319/lib/ytnef.c#L1449-L1458
• https://github.com/Yeraze/ytnef/blob/d9f089144414d3b0912c29ab96f8f1c591d00319/lib/ytnef.c#L1605-L1614
• https://github.com/Yeraze/ytnef/issues/112
• https://hackmd.io/@haind-pwn/ytnef-decompressrtf-oob-read
• https://www.vulncheck.com/advisories/ytnef-through-2.1.2-heap-out-of-bounds-read-via-mapiprint-in-lib-ytnef-c

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