Vulnerability · Published Oct 15, 2026 · Assigned by VulnCheck
CVE-2026-111269libical through 4.0.6 Heap Out-of-Bounds Read via icalvalue_decode_ical_string
Medium 6.1
In plain English
A medium-severity out-of-bounds read in libical from libical. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).
Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.2%top 84.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
libical through 4.0.6 contains a heap-based out-of-bounds read in icalvalue_decode_ical_string() in src/libical/icalvalue.c when decoding input ending in a backslash. Attackers can supply escaped iCalendar text with a trailing backslash, causing the loop to read past the terminator and crash the application or leak adjacent heap memory.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libical3 | no fix listed | DEBIAN-CVE-2026-111269 |
| Debian:13 | libical3 | no fix listed | DEBIAN-CVE-2026-111269 |
| Debian:14 | libical3 | no fix listed | DEBIAN-CVE-2026-111269 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
References
- https://hackmd.io/@haind-pwn/libical-icalvalue-decode-ical-string-oob-read technical-description
- https://github.com/libical/libical/pull/1455 patch, issue-tracking
- https://github.com/libical/libical/commit/d753885ce2de7c105d6b8c405aa7aee1d98ad8de patch
- https://github.com/libical/libical/blob/9cfca65c122fa23b9680a28e0c9225a2fd015fc5/src/libical/icalvalue.c#L1608-L1645 technical-description
- https://github.com/libical/libical product
- VulnCheck Advisory: libical through 4.0.6 Heap Out-of-Bounds Read via icalvalue_decode_ical_string third-party-advisory