CVE-2026-111145

ytnef through 2.1.2 contains a heap out-of-bounds read vulnerability in DecompressRTF() in lib/ytnef.c that never validates uncompressedSize for uncompressed RTF streams. Attackers can supply a crafted winmail.dat TNEF attachment with a malicious PT_BINARY MAPI property to crash ytnefprint or libytnef callers and leak adjacent heap memory.

CVSS 4.0

6.9CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

6.1CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

EPSS

0.1% chance of exploitation in the next 30 days; higher than 2% of CVEs (scores of 2026-10-25)

CWE

CWE-125

Published

2026-10-15

Modified

2026-10-21

Record from

the NVD, synced 2026-10-21

References

• https://github.com/Yeraze/ytnef
• https://github.com/Yeraze/ytnef/blob/d9f089144414d3b0912c29ab96f8f1c591d00319/lib/ytnef.c#L1554-L1563
• 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-decompressrtf

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