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
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.
- Published
- Jun 15, 2012
- Updated
- Jun 16, 2026
- EPSS
- 7.3% · 94th percentile
- CWE
- CWE-787
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Report tools
Action score
39
Monitor
Low priority for now.
- CVSS
- 37 / 40 · 9.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 2 / 30 · 7.3%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| qt | qt | cpe:2.3:a:qt:qt |
| gnome | pango | cpe:2.3:a:gnome:pango |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
| redhat | enterprise linux desktop | cpe:2.3:o:redhat:enterprise_linux_desktop |
| redhat | enterprise linux eus | cpe:2.3:o:redhat:enterprise_linux_eus |
| redhat | enterprise linux server | cpe:2.3:o:redhat:enterprise_linux_server |
| redhat | enterprise linux workstation | cpe:2.3:o:redhat:enterprise_linux_workstation |
| opensuse | opensuse | cpe:2.3:o:opensuse:opensuse |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- canonical ubuntu linux10.04
- canonical ubuntu linux11.04
- gnome pangobefore 1.25.1
- opensuse opensuse11.3
- opensuse opensuse11.4
- qt qtbefore 4.7.4
- redhat enterprise linux desktop4.0
- redhat enterprise linux desktop5.0
- redhat enterprise linux desktop6.0
- redhat enterprise linux eus6.1
- redhat enterprise linux server4.0
- redhat enterprise linux server5.0
- redhat enterprise linux server6.0
- redhat enterprise linux workstation4.0
- redhat enterprise linux workstation5.0
- redhat enterprise linux workstation6.0
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | pango1.0 | before 1.28.3-1 | 1.28.3-1 |
| Debian:6.0 | qt4-x11 | before 4:4.6.3-4+squeeze2 | 4:4.6.3-4+squeeze2 |
| Red Hat:enterprise_linux:4::as | evolution28-pango | before 0:1.14.9-13.el4_11 | 0:1.14.9-13.el4_11 |
| Red Hat:enterprise_linux:4::as | evolution28-pango-debuginfo | before 0:1.14.9-13.el4_11 | 0:1.14.9-13.el4_11 |
| Red Hat:enterprise_linux:4::as | evolution28-pango-devel | before 0:1.14.9-13.el4_11 | 0:1.14.9-13.el4_11 |
| Red Hat:enterprise_linux:4::as | frysk | before 0:0.0.1.2007.08.03-8.el4 | 0:0.0.1.2007.08.03-8.el4 |
| Red Hat:enterprise_linux:4::as | frysk-debuginfo | before 0:0.0.1.2007.08.03-8.el4 | 0:0.0.1.2007.08.03-8.el4 |
| Red Hat:enterprise_linux:5::client | pango | before 0:1.14.9-8.el5_7.3 | 0:1.14.9-8.el5_7.3 |
| Red Hat:enterprise_linux:5::client | pango-debuginfo | before 0:1.14.9-8.el5_7.3 | 0:1.14.9-8.el5_7.3 |
| Red Hat:enterprise_linux:5::client | qt4 | before 0:4.2.1-1.el5_7.1 | 0:4.2.1-1.el5_7.1 |
| Red Hat:enterprise_linux:5::client | qt4-debuginfo | before 0:4.2.1-1.el5_7.1 | 0:4.2.1-1.el5_7.1 |
| Red Hat:enterprise_linux:5::client | qt4-doc | before 0:4.2.1-1.el5_7.1 | 0:4.2.1-1.el5_7.1 |
| Red Hat:enterprise_linux:5::client | qt4-mysql | before 0:4.2.1-1.el5_7.1 | 0:4.2.1-1.el5_7.1 |
| Red Hat:enterprise_linux:5::client | qt4-odbc | before 0:4.2.1-1.el5_7.1 | 0:4.2.1-1.el5_7.1 |
| Red Hat:enterprise_linux:5::client | qt4-postgresql | before 0:4.2.1-1.el5_7.1 | 0:4.2.1-1.el5_7.1 |
| Red Hat:enterprise_linux:5::client | qt4-sqlite | before 0:4.2.1-1.el5_7.1 | 0:4.2.1-1.el5_7.1 |
| Red Hat:enterprise_linux:5::client_workstation | pango-devel | before 0:1.14.9-8.el5_7.3 | 0:1.14.9-8.el5_7.3 |
| Red Hat:enterprise_linux:5::client_workstation | qt4-devel | before 0:4.2.1-1.el5_7.1 | 0:4.2.1-1.el5_7.1 |
| Red Hat:enterprise_linux:6::client | phonon-backend-gstreamer | before 1:4.6.2-20.el6 | 1:4.6.2-20.el6 |
| Red Hat:enterprise_linux:6::client | qt | before 1:4.6.2-20.el6 | 1:4.6.2-20.el6 |
| Red Hat:enterprise_linux:6::client | qt-debuginfo | before 1:4.6.2-20.el6 | 1:4.6.2-20.el6 |
| Red Hat:enterprise_linux:6::client | qt-demos | before 1:4.6.2-20.el6 | 1:4.6.2-20.el6 |
| Red Hat:enterprise_linux:6::client | qt-devel | before 1:4.6.2-20.el6 | 1:4.6.2-20.el6 |
| Red Hat:enterprise_linux:6::client | qt-doc | before 1:4.6.2-20.el6 | 1:4.6.2-20.el6 |
+18
Same product
qt: all recordsOther highest-scoring records for the same primary product.
- CVE-2020-12267setMarkdown in Qt before 5.14.2 has a use-after-free related to QTextMarkdownImporter::insertBlock.40Plan
- CVE-2018-19873An issue was discovered in Qt before 5.11.3.40Plan
- CVE-2017-10904Qt for Android prior to 5.9.0 allows remote attackers to execute arbitrary OS commands via unspecified vectors.40Plan
- CVE-2024-36048QAbstractOAuth in Qt Network Authorization in Qt before 5.15.17, 6.x before 6.2.13, 6.3.x through 6.5.x before 6.5.6, and 6.6.x through 6.7.39Monitor
- CVE-2023-51714An issue was discovered in the HTTP2 implementation in Qt before 5.15.17, 6.x before 6.2.11, 6.3.x through 6.5.x before 6.5.4, and 6.6.x bef39Monitor
- CVE-2011-3194Buffer overflow in the TIFF reader in gui/image/qtiffhandler.cpp in Qt 4.7.4 allows remote attackers to cause a denial of service (crash) an39Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:pango1.0 | 1.28.3-1 · Debian:12 | Package registry (OSV) |
| debian:qt4-x11 | 4:4.6.3-4+squeeze2 · Debian:6.0 | Package registry (OSV) |
| red hat:phonon-backend-gstreamer | 1:4.6.2-17.el6_1.1 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
| red hat:qt | 1:4.6.2-17.el6_1.1 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
| red hat:qt-debuginfo | 1:4.6.2-17.el6_1.1 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
| red hat:qt-demos | 1:4.6.2-17.el6_1.1 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
| red hat:qt-devel | 1:4.6.2-17.el6_1.1 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
| red hat:qt-doc | 1:4.6.2-17.el6_1.1 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
| red hat:qt-examples | 1:4.6.2-17.el6_1.1 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
| red hat:qt-mysql | 1:4.6.2-17.el6_1.1 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
| red hat:qt-odbc | 1:4.6.2-17.el6_1.1 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
| red hat:qt-postgresql | 1:4.6.2-17.el6_1.1 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
| red hat:qt-sqlite | 1:4.6.2-17.el6_1.1 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
| red hat:qt-x11 | 1:4.6.2-17.el6_1.1 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
If successful
- Confidentiality
- C · data can be read
- Integrity
- C · data or configuration can be modified
- Availability
- C · the service can be disrupted
- Attack complexity
- M
- Confidentiality impact
- C
- Integrity impact
- C
- Availability impact
- C
Weakness class (CWE)
CWE-787 · Out-of-bounds WriteCVSS vector
AV:N/AC:M/Au:N/C:C/I:C/A:C
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- cgit.freedesktop.org/harfbuzz.old/commit/?id=81c8ef785b079980ad5b46be4fe7c7bf156dbf65
- cgit.freedesktop.org/harfbuzz/commit/src/harfbuzz-gpos.c?id=da2c52abcd75d46929b34cad55c4fb2c8892bc08
- git.gnome.org/browse/pango/commit/pango/opentype/harfbuzz-gpos.c?id=a7a715480db66148b1f487528887508a7991dcd0
- lists.opensuse.org/opensuse-updates/2011-10/msg00007.html
- lists.opensuse.org/opensuse-updates/2011-10/msg00008.html
- rhn.redhat.com/errata/RHSA-2011-1323.html
- rhn.redhat.com/errata/RHSA-2011-1324.html
- rhn.redhat.com/errata/RHSA-2011-1325.html
- rhn.redhat.com/errata/RHSA-2011-1326.html
- rhn.redhat.com/errata/RHSA-2011-1327.html
- rhn.redhat.com/errata/RHSA-2011-1328.html
- secunia.com/advisories/41537
- secunia.com/advisories/46117
- secunia.com/advisories/46118
- secunia.com/advisories/46119
- secunia.com/advisories/46128
- secunia.com/advisories/46371
- secunia.com/advisories/46410
- secunia.com/advisories/49895
- www.openwall.com/lists/oss-security/2011/08/22/6
Vendor advisories and official records. Exploit/PoC links are deliberately left out.