What’s Vulnerable › Vulnerabilities

CVE-2026-111145: ytnef through 2.1.2 Heap Out-of-Bounds Read via DecompressRTF

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-15 · updated 2026-10-21
• Weakness: CWE-125

Description

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.

Affected products

• Yeraze ytnef: through 2.1.2

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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