Description
An issue was discovered in libexpat before 2.6.3. xmlparse.c does not reject a negative length for XML_ParseBuffer.
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 | expat | 2.6.2-2 | — |
| Debian 13 | expat | 2.6.2-2 | — |
| Debian 12 | expat | 2.5.0-1+deb12u1 | DSA-5770-1 |
| Debian 12 | libxmltok | No fix yet | — |
| Debian 11 | expat | 2.2.10-2+deb11u6 | DLA-3893-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | tdom +5 | No fix yet | — |
| Ubuntu 26.04 LTS | tdom +4 | No fix yet | — |
| Ubuntu 25.10 | tdom +5 | No fix yet | — |
| Ubuntu 24.04 LTS | expat | 2.6.1-2ubuntu0.1 | USN-7000-1 |
| Ubuntu 24.04 LTS | tdom +3 | No fix yet | — |
| Ubuntu 22.04 LTS | expat | 2.4.7-1ubuntu0.4 | USN-7000-2 |
| Ubuntu 22.04 LTS | tdom +4 | No fix yet | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | expat | 2.2.9-1ubuntu0.7 | USN-7000-1 |
| Ubuntu 20.04 LTS | tdom +4 | No fix yet | — |
| Ubuntu 18.04 LTS | gdcm +7 | No fix yet | — |
| Ubuntu 16.04 LTS | gdcm +6 | No fix yet | — |
| Ubuntu Pro 26.04 LTS | swish-e | No fix yet | — |
| Ubuntu Pro 24.04 LTS | libxmltok | 1.2-4.1ubuntu2.24.0.4.1+esm1 | USN-7001-2 |
| Ubuntu Pro 24.04 LTS | swish-e +1 | No fix yet | — |
| Ubuntu Pro 22.04 LTS | libxmltok | 1.2-4ubuntu0.22.04.1~esm3 | USN-7001-1 |
| Ubuntu Pro 22.04 LTS | swish-e +1 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | libxmltok | 1.2-4ubuntu0.20.04.1~esm3 | USN-7001-1 |
| Ubuntu Pro 20.04 LTS | swish-e +1 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | coin3 +2 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | expat | 2.2.5-3ubuntu0.9+esm1 | USN-7000-1 |
| Ubuntu Pro 18.04 LTS | libxmltok | 1.2-4ubuntu0.18.04.1~esm3 | USN-7001-1 |
| Ubuntu Pro 16.04 LTS | expat | 2.1.0-7ubuntu0.16.04.5+esm9 | USN-7000-1 |
| Ubuntu Pro 16.04 LTS | libxmltok | 1.2-3ubuntu0.16.04.1~esm4 | USN-7001-1 |
| Ubuntu Pro 16.04 LTS | vtk +6 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | expat | 2.1.0-4ubuntu1.4+esm9 | USN-7000-1 |
| Ubuntu Pro 14.04 LTS | vtk +3 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | expat +1 | 2.5.0-2.el9_4.1 | RHSA-2024:6754 |
| RHEL 8 | expat +1 | 2.2.5-15.el8_10 | RHSA-2024:6989 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | expat +1 | 2.5.0-2.el9_4.1 | ALSA-2024:6754 |
| AlmaLinux 8 | expat +1 | 2.2.5-15.el8_10 | ALSA-2024:6989 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | expat | 2.5.0-2.el9_4.1 | RLSA-2024:6754 |
| Rocky Linux 8 | expat | 2.2.5-15.el8_10 | RLSA-2024:6989 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | mozjs52 | 52.6.0-150000.3.9.1 | SUSE-SU-2025:4512-1 |
| SLES 15 SP7 | mozjs60 | 60.9.0-150200.6.8.1 | SUSE-SU-2026:0044-1 |
| SLES 15 SP6 | expat | 2.4.4-150400.3.22.1 | SUSE-SU-2024:3216-1 |
| SLES 15 SP6 | mozjs115 | 115.4.0-150600.3.3.1 | SUSE-SU-2024:3538-1 |
| SLES 15 SP6 | mozjs78 | 78.15.0-150400.3.6.2 | SUSE-SU-2024:3554-1 |
| SLES 15 SP5 | expat | 2.4.4-150400.3.22.1 | SUSE-SU-2024:3216-1 |
| SLES 15 SP5 | mozjs78 | 78.15.0-150400.3.6.2 | SUSE-SU-2024:3554-1 |
| SLES 12 SP5 | expat | 2.1.0-21.37.1 | SUSE-SU-2024:3182-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | expat | 2.1.0-21.37.1 | SUSE-SU-2024:3182-1 |
| SLE Micro 6.1 | expat | 2.7.1-slfo.1.1_1.1 | SUSE-SU-2025:20311-1 |
| SLE Micro 6.0 | expat | 2.5.0-3.1 | SUSE-SU-2025:20207-1, SUSE-SU-2025:20045-1 |
| SLE Micro 5.5 | expat | 2.4.4-150400.3.22.1 | SUSE-SU-2024:3216-1 |
| SLE Micro 5.4 | expat | 2.4.4-150400.3.22.1 | SUSE-SU-2024:3216-1 |
| SLE Micro 5.4 | mozjs60 | 60.9.0-150200.6.8.1 | SUSE-SU-2026:0044-1 |
| SLE Micro 5.3 | expat | 2.4.4-150400.3.22.1 | SUSE-SU-2024:3216-1 |
| SLE Micro 5.3 | mozjs60 | 60.9.0-150200.6.8.1 | SUSE-SU-2026:0044-1 |
| SLE Micro 5.2 | expat | 2.2.5-150000.3.30.1 | SUSE-SU-2024:3515-1 |
| SLE Micro 5.2 | mozjs60 | 60.9.0-150200.6.8.1 | SUSE-SU-2026:0044-1 |
| SLE Micro 5.1 | expat | 2.2.5-150000.3.30.1 | SUSE-SU-2024:3515-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | expat | 2.6.3-1.1 | openSUSE-SU-2024:14322-1 |
| openSUSE Tumbleweed | mozjs115 | 115.4.0-5.1 | openSUSE-SU-2024:14379-1 |
| openSUSE Tumbleweed | mozjs128 | 128.2.0-2.1 | openSUSE-SU-2024:14380-1 |
| openSUSE Tumbleweed | mozjs78 | 78.15.0-5.1 | openSUSE-SU-2024:14381-1 |
| openSUSE Tumbleweed | x3270 | 4.3-4.1 | openSUSE-SU-2024:14328-1 |
| openSUSE Leap 15.6 | expat | 2.4.4-150400.3.22.1 | SUSE-SU-2024:3216-1 |
| openSUSE Leap 15.6 | mozjs115 | 115.4.0-150600.3.3.1 | SUSE-SU-2024:3538-1 |
| openSUSE Leap 15.6 | mozjs52 | 52.6.0-150000.3.9.1 | SUSE-SU-2025:4512-1 |
| openSUSE Leap 15.6 | mozjs60 | 60.9.0-150200.6.8.1 | SUSE-SU-2026:0044-1 |
| openSUSE Leap 15.6 | mozjs78 | 78.15.0-150400.3.6.2 | SUSE-SU-2024:3554-1 |
| openSUSE Leap 15.5 | expat | 2.4.4-150400.3.22.1 | SUSE-SU-2024:3216-1 |
| openSUSE Leap 15.5 | mozjs78 | 78.15.0-150400.3.6.2 | SUSE-SU-2024:3554-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.5 | expat | 2.4.4-150400.3.22.1 | SUSE-SU-2024:3216-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | expat | 2.6.3-r0 | — |
| Alpine v3.24 | qt6-qtwebengine | 6.7.2-r6 | — |
| Alpine v3.23 | expat | 2.6.3-r0 | — |
| Alpine v3.23 | qt5-qtwebengine | 5.15.17-r3 | — |
| Alpine v3.23 | qt6-qtwebengine | 6.7.2-r6 | — |
| Alpine v3.22 | expat | 2.6.3-r0 | — |
| Alpine v3.22 | qt5-qtwebengine | 5.15.17-r3 | — |
| Alpine v3.22 | qt6-qtwebengine | 6.7.2-r6 | — |
| Alpine v3.21 | expat | 2.6.3-r0 | — |
| Alpine v3.21 | qt5-qtwebengine | 5.15.17-r3 | — |
| Alpine v3.21 | qt6-qtwebengine | 6.7.2-r6 | — |
| Alpine v3.20 | expat | 2.6.3-r0 | — |
| Alpine v3.20 | qt5-qtwebengine | 5.15.16-r12 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | expat | 2.6.3-r0 | — |
| Alpine v3.18 | expat | 2.6.3-r0 | — |
| Alpine v3.17 | expat | 2.6.3-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | expat +2 | 2.6.3-1.amzn2023.0.1 | ALAS2023-2024-759 |
| Amazon Linux 2 | expat +2 | 2.1.0-15.amzn2.0.4 | ALAS2-2024-2710 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | expat | 2.6.3-1 | — |
| Azure Linux 2 (CBL-Mariner) | expat | 2.6.3-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | expat +1 | 2.5.0-2.el9_4.1 | ELSA-2024-6754 |
| Oracle Linux 8 | expat +1 | 2.2.5-15.0.1.el8_10 | ELSA-2024-6989 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | expat | 2.6.3-r0 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
jstjep00/CVE-2024-45490-libexpat-poc ★ 0 · Oct 24, 2026
PoC + Docker test harness for CVE-2024-45490 (libexpat XML_ParseBuffer negative length integer handling issue)
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 48
- ALSA-2024:6754 Moderate: expat security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:6989 Moderate: expat security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:6989 Red Hat Security Advisory: expat security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2024:6754 Red Hat Security Advisory: expat security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- SSA-082556 SSA-082556: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.5 Siemens ProductCERT · Oct 13, 2026
- ICSA-25-259-02 Hitachi Energy RTU500 Series CISA ICS & IT advisories · Oct 8, 2026
- WID-SEC-2024-1951 expat: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Sep 15, 2026
- USN-7000-1 expat vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-7001-1 libxmltok vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- ICSA-25-162-05 Siemens SIMATIC S7-1500 CPU family CISA ICS & IT advisories · May 14, 2026
- USN-7001-2 libxmltok vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-7000-2 expat vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- SUSE-SU-2025:4512-1 Security update for mozjs52 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20045-1 Security update for expat SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20311-1 Security update for expat SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20207-1 Security update for expat SUSE / openSUSE Security Updates · Mar 23, 2026
- DSA-5770-1 expat - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3893-1 expat - security update Debian Security (DSA / DLA) · Mar 9, 2026
- ICSA-25-226-15 Siemens SINEC OS CISA ICS & IT advisories · Feb 25, 2026
- SSA-613116 SSA-613116: Multiple Vulnerabilities in Third-Party Components in SINEC OS before V3.1 Siemens ProductCERT · Feb 24, 2026
- RLSA-2024:6989 Moderate: expat security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2024:6754 Moderate: expat security update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2026:0044-1 Security update for mozjs60 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14380-1 libmozjs-128-0-128.2.0-2.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14328-1 x3270-4.3-4.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3554-1 Security update for mozjs78 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3538-1 Security update for mozjs115 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14322-1 expat-2.6.3-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14379-1 libmozjs-115-0-115.4.0-5.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3216-1 Security update for expat SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3182-1 Security update for expat SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3515-1 Security update for expat SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-3692 Apple macOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 31, 2025
- NCSC-2025-0187 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Jun 10, 2025
- WID-SEC-2024-3691 Apple iOS und iPadOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 12, 2025
- openSUSE-SU-2024:14381-1 libmozjs-78-0-78.15.0-5.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- NCSC-2025-0027 Kwetsbaarheden verholpen in Oracle Fusion Middleware NCSC-NL (Netherlands) · Jan 22, 2025
- NCSC-2025-0025 Kwetsbaarheden verholpen in Oracle Financial Services NCSC-NL (Netherlands) · Jan 22, 2025
- NCSC-2025-0021 Kwetsbaarheden verholpen in Oracle Communications NCSC-NL (Netherlands) · Jan 22, 2025
- NCSC-2025-0020 Kwetsbaarheden verholpen in Oracle Database producten NCSC-NL (Netherlands) · Jan 22, 2025
- ALAS2-2024-2710 Important: expat security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Dec 19, 2024
- NCSC-2024-0488 Kwetsbaarheden verholpen in macOS NCSC-NL (Netherlands) · Dec 12, 2024
- NCSC-2024-0487 Kwetsbaarheden verholpen in Apple iPadOS en iOS NCSC-NL (Netherlands) · Dec 12, 2024
- ALAS2023-2024-759 Important: expat security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 14, 2024
- ICSA-24-317-01 Subnet Solutions PowerSYSTEM Center CISA ICS & IT advisories · Nov 12, 2024
- NCSC-2024-0411 Kwetsbaarheden verholpen in Oracle Database producten NCSC-NL (Netherlands) · Oct 17, 2024
- ELSA-2024-6989 Moderate: expat security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Sep 24, 2024
- ELSA-2024-6754 Moderate: expat security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Sep 18, 2024