CVE-2026-111269

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.

References

• https://github.com/libical/libical
• https://github.com/libical/libical/blob/9cfca65c122fa23b9680a28e0c9225a2fd015fc5/src/libical/icalvalue.c#L1608-L1645
• https://github.com/libical/libical/commit/d753885ce2de7c105d6b8c405aa7aee1d98ad8de
• https://github.com/libical/libical/pull/1455
• https://hackmd.io/@haind-pwn/libical-icalvalue-decode-ical-string-oob-read