Description
Stack-based buffer overflow in the _canonicalize function in common/uloc.c in International Components for Unicode (ICU) before 49.1 allows remote attackers to execute arbitrary code via a crafted locale ID that is not properly handled during variant canonicalization.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | icu | 4.8.1.1-3 | — |
| Debian 13 | icu | 4.8.1.1-3 | — |
| Debian 12 | icu | 4.8.1.1-3 | — |
| Debian 6.0 | icu | 4.4.1-8 | DSA-2397-1 |
| Debian 5.0 | icu | 3.8.1-3+lenny3 | DSA-2397-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | icu +3 | 4.2.1-9.1.el6_2 | RHSA-2011:1815 |
| RHEL 5 | icu +3 | 3.6-5.16.1 | RHSA-2011:1815 |
Advisories 2
- RHSA-2011:1815 Red Hat Security Advisory: icu security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-2397-1 icu - buffer underflow Debian Security (DSA / DLA) · Mar 9, 2026
References
- 51006 vdb-entry
- 47674 third-party-advisory
- 47146 third-party-advisory
- 47775 third-party-advisory
- APPLE-SA-2012-09-19-1 vendor-advisory
- http://support.apple.com/kb/HT5503
- icu-canonicalize-bo(71726) vdb-entry
- [oss-security] 20111209 Re: CVE Request: icu out of bounds access mailing-list
- http://code.google.com/p/chromium/issues/detail?id=106441
- 77698 vdb-entry
- http://bugs.icu-project.org/trac/ticket/8984
- USN-1348-1 vendor-advisory
- 47227 third-party-advisory
- MDVSA-2011:194 vendor-advisory
- openSUSE-SU-2012:0100 vendor-advisory
- APPLE-SA-2012-09-19-2 vendor-advisory
- http://support.apple.com/kb/HT5501
- [oss-security] 20111209 CVE Request: icu out of bounds access mailing-list
- RHSA-2011:1815 vendor-advisory
- DSA-2397 vendor-advisory
- 47714 third-party-advisory