Bug 2553858 (CVE-2026-111269)

Summary: CVE-2026-111269 libical: libical: Denial of Service via out-of-bounds read in icalvalue_decode_ical_string()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in libical. When decoding calendar input ending with a trailing backslash, the library can read beyond allocated memory boundaries in the icalvalue_decode_ical_string() function. An attacker could supply specially crafted iCalendar data to cause an application crash, leading to a Denial of Service (DoS), or potentially expose adjacent memory contents.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2553981    
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Description OSIDB Bzimport 2026-10-15 21:59:18 UTC
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.