What’s Vulnerable › Vulnerabilities

CVE-2026-111269: libical through 4.0.6 Heap Out-of-Bounds Read via icalvalue_decode_ical_string

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-15 · updated 2026-10-26
• Weakness: CWE-125

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 products

• libical: through 4.0.6

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
• https://www.vulncheck.com/advisories/libical-through-4.0.6-heap-out-of-bounds-read-via-icalvalue-decode-ical-string
• https://hackmd.io/@haind-pwn/libical-icalvalue-decode-ical-string-oob-read

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