Description
Heap-based buffer overflow in the Lookup_MarkMarkPos function in the HarfBuzz module (harfbuzz-gpos.c), as used by Qt before 4.7.4 and Pango, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted font file.
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 | pango1.0 | 1.28.3-1 | — |
| Debian 13 | pango1.0 | 1.28.3-1 | — |
| Debian 12 | pango1.0 | 1.28.3-1 | — |
| Debian 6.0 | qt4-x11 | 4:4.6.3-4+squeeze2 | DLA-117-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | qt +10 | 1:4.6.2-17.el6_1.1 | RHSA-2011:1328, RHSA-2011:1323 |
| RHEL 5 | pango +1 | 1.14.9-8.el5_7.3 | RHSA-2011:1326 |
| RHEL 5 | qt4 +6 | 4.2.1-1.el5_7.1 | RHSA-2011:1324 |
| RHEL 4 | evolution28-pango +1 | 1.14.9-13.el4_11 | RHSA-2011:1325 |
| RHEL 4 | frysk | 0.0.1.2007.08.03-8.el4 | RHSA-2011:1327 |
Advisories 7
- RHSA-2011:1323 Red Hat Security Advisory: qt security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2011:1324 Red Hat Security Advisory: qt4 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2011:1328 Red Hat Security Advisory: qt security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2011:1326 Red Hat Security Advisory: pango security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2011:1325 Red Hat Security Advisory: evolution28-pango security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DLA-117-1 qt4-x11 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RHSA-2011:1327 Red Hat Security Advisory: frysk security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
References
- 46371 third-party-advisory
- http://git.gnome.org/browse/pango/commit/pango/opentype/harfbuzz-gpos.c?id=a7a715480db66148b1f487528887508a7991dcd0
- USN-1504-1 vendor-advisory
- [oss-security] 20120824 Re: CVE request: libqt4: two memory issues mailing-list
- openSUSE-SU-2011:1119 vendor-advisory
- 41537 third-party-advisory
- 46410 third-party-advisory
- RHSA-2011:1327 vendor-advisory
- RHSA-2011:1325 vendor-advisory
- [oss-security] 20120822 CVE request: libqt4: two memory issues mailing-list
- 46128 third-party-advisory
- RHSA-2011:1324 vendor-advisory
- [oss-security] 20120825 Re: CVE request: libqt4: two memory issues mailing-list
- 49895 third-party-advisory
- 46117 third-party-advisory
- RHSA-2011:1326 vendor-advisory
- 46119 third-party-advisory
- 49723 vdb-entry
- http://cgit.freedesktop.org/harfbuzz/commit/src/harfbuzz-gpos.c?id=da2c52abcd75d46929b34cad55c4fb2c8892bc08
- RHSA-2011:1323 vendor-advisory
- SUSE-SU-2011:1113 vendor-advisory
- http://cgit.freedesktop.org/harfbuzz.old/commit/?id=81c8ef785b079980ad5b46be4fe7c7bf156dbf65
- RHSA-2011:1328 vendor-advisory
- https://qt.gitorious.org/qt/qt/commit/9ae6f2f9a57f0c3096d5785913e437953fa6775c
- 75652 vdb-entry
- 46118 third-party-advisory
- pango-harfbuzz-bo(69991) vdb-entry
- openSUSE-SU-2011:1120 vendor-advisory