CVE-2026-111269
libical through 4.0.6 Heap Out-of-Bounds Read via icalvalue_decode_ical_string
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Passive
What an attacker can affect
- Confidentiality
- Low
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
libical through 4.0.6 Heap Out-of-Bounds Read via icalvalue_decode_ical_string
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.
- Record
CVE-2026-111269- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N - CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H - Weakness
- CWE-125
- Updated
- 2026-11-02
EUVDEUVD-2026-102524
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.
- Record
EUVD-2026-102524- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-qvfg-9jj8-868q
libical through 4.0.6 contains a heap-based out-of-bounds read in icalvalue_decode_ical_string()...
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.
- Record
GHSA-qvfg-9jj8-868q- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H - Weakness
- CWE-125
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-111269- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H - Weakness
- CWE-125
- Updated
- 2026-11-02
OSVBELL-CVE-2026-111269
- Record
BELL-CVE-2026-111269- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H - Updated
- 2026-11-02
OSV
libical through 4.0.6 Heap Out-of-Bounds Read via icalvalue_decode_ical_string
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.
- Record
CVE-2026-111269- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N - Weakness
- CWE-125
- Updated
- 2026-11-02
Show 8 moreShow less
OSVDEBIAN-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.
- Record
DEBIAN-CVE-2026-111269- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Updated
- 2026-11-02
OSVOESA-2026-4550
libical security update
Libical is an open source implementation of the IETF's iCalendar calendaring and scheduling protocols (RFC 2445, 2446, and 2447). It parses iCal components and provides a C API for manipulating the component properties, parameters, and subcomponents.
Security Fix(es):
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.(CVE-2026-111269)
- Record
OESA-2026-4550- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H - Updated
- 2026-11-02
OSVOESA-2026-4551
libical security update
Libical is an open source implementation of the IETF's iCalendar calendaring and scheduling protocols (RFC 2445, 2446, and 2447). It parses iCal components and provides a C API for manipulating the component properties, parameters, and subcomponents.
Security Fix(es):
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.(CVE-2026-111269)
- Record
OESA-2026-4551- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H - Updated
- 2026-11-02
OSVOESA-2026-4552
libical security update
Libical is an open source implementation of the IETF's iCalendar calendaring and scheduling protocols (RFC 2445, 2446, and 2447). It parses iCal components and provides a C API for manipulating the component properties, parameters, and subcomponents.
Security Fix(es):
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.(CVE-2026-111269)
- Record
OESA-2026-4552- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H - Updated
- 2026-11-02
OSVOESA-2026-4553
libical security update
Libical is an open source implementation of the IETF's iCalendar calendaring and scheduling protocols (RFC 2445, 2446, and 2447). It parses iCal components and provides a C API for manipulating the component properties, parameters, and subcomponents.
Security Fix(es):
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.(CVE-2026-111269)
- Record
OESA-2026-4553- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-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.
- Record
UBUNTU-CVE-2026-111269- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N - CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H - Updated
- 2026-11-02
OSVAZL-108293 No score
CVE-2026-111269 affecting package libical for versions less than 3.0.10-3
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.
- Record
AZL-108293- Updated
- 2026-11-07
OSVMGASA-2026-0553 No score
Updated libical package fixes security vulnerabilities
Denial of Service via crafted iCalendar property parsing. (CVE-2026-88383) Heap Out-of-Bounds Read via icalvalue_decode_ical_string. (CVE-2026-111269)
- Record
MGASA-2026-0553- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
libicalAzure Linux:3 |
before 3.0.10-3 | 3.0.10-3 |
libicalAlpaquita:23 |
3.0.16-r1 and later | None known |
libicalAlpaquita:25 |
3.0.20-r0 and later | None known |
libicalAlpaquita:stream |
3.0.14-r0 and later | None known |
libical3Debian:12 |
All versions, plus listed versions 3.0.16-13.0.17-13.0.17-1.13.0.17-1.1~exp13.0.18-1 Show 7 moreShow less3.0.19-13.0.19-23.0.19-33.0.19-43.0.20-13.0.20-23.0.20-3 |
None known |
libical3Debian:13 |
All versions, plus listed versions 3.0.20-13.0.20-23.0.20-3 |
None known |
libical3Debian:14 |
All versions, plus listed versions 3.0.20-13.0.20-23.0.20-3 |
None known |
libicalMageia:10 From an advisory covering 2 CVEs |
before 3.0.20-2.1.mga10 | 3.0.20-2.1.mga10 |
libicalopenEuler:24.03-LTS-SP3 |
before 3.0.17-4.oe2403sp3 | 3.0.17-4.oe2403sp3 |
libicalopenEuler:24.03-LTS-SP4 |
before 3.0.17-4.oe2403sp4 | 3.0.17-4.oe2403sp4 |
Show 4 moreShow less
| Package | Affected | Fixed |
|---|---|---|
libicalopenEuler:22.03-LTS-SP4 |
before 3.0.11-4.oe2203sp4 | 3.0.11-4.oe2203sp4 |
libicalopenEuler:24.03-LTS-SP1 |
before 3.0.17-4.oe2403sp1 | 3.0.17-4.oe2403sp1 |
libicalUbuntu:16.04:LTS |
All versions, plus listed versions 1.0.1-0ubuntu11.0.1-0ubuntu2 |
None known |
libicalUbuntu:18.04:LTS |
All versions, plus listed versions 2.0.0-0.52.0.0-0.5build12.0.0-1ubuntu12.0.0-4 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | OSV | |
| affected | ||
| facts | OSV | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-111269 is a medium vulnerability (CVSS 6.9) in Libical, published October 15, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.24%, the 15th percentile. Fixed in libical 3.0.10-3.
References
hackmd.io/@haind-pwn/libical-icalvalue-decode-ical-string-oob-read
github.com/libical/libical/pull/1455
vulncheck.com/advisories/libical-through-4.0.6-heap-out-of-bounds-read-via-icalvalue-decode-ical-string
Show 16 moreShow less
nvd.nist.gov/vuln/detail/CVE-2026-111269
docs.bell-sw.com/security/cves/CVE-2026-111269
security-tracker.debian.org/tracker/CVE-2026-111269
advisories.mageia.org/MGASA-2026-0553.html
bugs.mageia.org/show_bug.cgi?id=36475
lists.fedoraproject.org/archives/list/[email protected]/message/IS2XULHAXRU4HV4TBL2ALZSHAFHMXM5Y
bugzilla.redhat.com/show_bug.cgi?id=2540947
openeuler.org/zh/security/security-bulletins/detail?id=openEuler-SA-2026-4550
ubuntu.com/security/CVE-2026-111269
cve.org/CVERecord?id=CVE-2026-111269