CVE-2026-111146
ytnef through 2.1.2 Heap Out-of-Bounds Read via MAPIPrint in lib/ytnef.c
Yeraze ytnef
CVSS
6.9MediumExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 15 Oct 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.13%Chance of exploitation activity in the next 30 days, higher than 2% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
Description
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.
Text from CVE List
Affected versions 1
- ytnefaffected: all versions through 2.1.2CVE List
References 6
- vulncheck.com/advisories/ytnef-through-2.1.2-heap-out-of-bounds-read-via-mapiprint-in-lib-ytnef-cAdvisoryvia CVE List
- hackmd.io/@haind-pwn/ytnef-decompressrtf-oob-readExploitvia CVE List
- github.com/Yeraze/ytnef/issues/112Referencevia CVE List
- github.com/Yeraze/ytnef/blob/d9f089144414d3b0912c29ab96f8f1c591d00319/lib/ytnef.c#L1449-L1458Referencevia CVE List
- github.com/Yeraze/ytnef/blob/d9f089144414d3b0912c29ab96f8f1c591d00319/lib/ytnef.c#L1605-L1614Referencevia CVE List
- github.com/Yeraze/ytnefReferencevia CVE List