Out-of-bounds Read in Libical
CVE-2026-111269
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@haind-pwn/libical-icalvalue-decode-ical-string-oob-read (technical-description)
- github.com/libical/libical/pull/1455 (issue-tracking, patch)
- github.com/libical/libical/commit/d753885ce2de7c105d6b8c405aa7aee1d98ad8de (patch)
- github.com/libical/libical/blob/9cfca65c122fa23b9680a28e0c9225a2fd015fc5/src/li… (technical-description)
- github.com/libical/libical (product)
- www.vulncheck.com/advisories/libical-through-4.0.6-heap-out-of-bounds-read-via-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111269?
- CVE-2026-111269 is a medium-severity vulnerability in Libical, classified under Out-of-bounds Read. CVSS score: 6.1/10. Published 2026-10-15.
- How severe is CVE-2026-111269?
- Medium severity. CVSS v3 base score is 6.1 out of 10.