Vulnerability · Published Oct 16, 2026 · Assigned by VulnCheck
CVE-2026-111677Antiword through 0.37 Heap Out-of-Bounds Read via vGet8LstInfo in prop8.c
Medium 5.5
In plain English
A medium-severity out-of-bounds read in antiword from Adri van Os. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).
Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.2%top 91.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
Antiword through 0.37 contains a heap out-of-bounds read vulnerability in vGet8LstInfo in prop8.c caused by an inverted bounds check on the PlcfLst record count. Attackers can supply a crafted Word 8 .doc file claiming up to 0xffff LSTF records in a tiny buffer, causing reads past the heap allocation that crash the process.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | antiword | no fix listed | DEBIAN-CVE-2026-111677 |
| Debian:13 | antiword | no fix listed | DEBIAN-CVE-2026-111677 |
| Debian:14 | antiword | no fix listed | DEBIAN-CVE-2026-111677 |
| Ubuntu:22.04:LTS | antiword | no fix listed | UBUNTU-CVE-2026-111677 |
| Ubuntu:24.04:LTS | antiword | no fix listed | UBUNTU-CVE-2026-111677 |
| Ubuntu:26.04:LTS | antiword | no fix listed | UBUNTU-CVE-2026-111677 |
| Ubuntu:26.10 | antiword | no fix listed | UBUNTU-CVE-2026-111677 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Adri van Os | antiword | 0 – through 0.37 |
Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- https://hackmd.io/@haindpwn/antiword-word8-plcflst-count-and-fkp-run-oob-read third-party-advisory
- https://github.com/rsdoiel/antiword/blob/fe4b579067122a2d9d62647efb1ee7cfe3ca92bb/prop8.c#L799-L825 technical-description
- VulnCheck Advisory: Antiword through 0.37 Heap Out-of-Bounds Read via vGet8LstInfo in prop8.c third-party-advisory