Technology · Libexpat Project
Libexpat Project Expat vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 22 vulnerabilities in Libexpat Project Expat: 0 in the last 7 days and 3 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-76641, was published on 20 August 2026.
- Last 7 days
- 0
- Last 90 days
- 3
- Critical, all time
- 0
- Exploited in the wild
- 0
About Libexpat Project Expat
Expat is a stream-oriented XML parser library written in C.
Latest Libexpat Project Expat vulnerabilities
- CVE-2026-76641: Expat out-of-bounds read in XML parserhighCVSS 7.5EPSS 0.6%
- CVE-2026-76957: libexpat use-after-free in custom encoding callbacksmediumCVSS 4.9EPSS 0.1%
- CVE-2026-66046: Expat XML parser denial of service via quadratic complexityhighCVSS 7.5EPSS 0.8%
- CVE-2026-56412: libexpat use-after-free in doCdataSectionmediumCVSS 4.9
- CVE-2026-56411: libexpat integer overflow in xmlwf endDoctypeDeclmediumCVSS 6.9
- CVE-2026-56410: libexpat xmlwf integer overflow in resolveSystemIdmediumCVSS 6.9
- CVE-2026-56409: libexpat xmlwf integer overflow in output filename handlingmediumCVSS 6.5
- CVE-2026-56408: libexpat integer overflow in copyStringmediumCVSS 6.9
- CVE-2026-56407: libexpat integer overflow in doProlog entity handlingmediumCVSS 6.9
- CVE-2026-56406: libexpat integer overflow in XML_ParseBuffermediumCVSS 6.9
- CVE-2026-56405: libexpat integer overflow in getAttributeIdmediumCVSS 6.9
- CVE-2026-56404: libexpat integer overflow in addBindingmediumCVSS 6.9
- CVE-2026-56403: libexpat integer overflow in storeAttsmediumCVSS 6.9
- CVE-2026-56132: libexpat heap buffer overflow in doPrologmediumCVSS 6.9
- CVE-2026-56131: libexpat use-after-free in XML_ResumeParsermediumCVSS 4.9
- CVE-2026-50219: libexpat use-after-free via insufficient handler call depth trackingmediumCVSS 4.9
- CVE-2026-45186: libexpat denial of service via attribute name collision checklowCVSS 2.9EPSS 0.3%
- CVE-2026-32778: libexpat NULL pointer dereference in setContext functionlowCVSS 2.9EPSS 0.1%
- CVE-2026-32777: libexpat infinite loop in entityValueProcessor during DTD parsingmediumCVSS 4EPSS 0.2%
- CVE-2026-25210: libexpat integer overflow in doContent tag buffer reallocationmediumCVSS 6.9EPSS 0.0%
- CVE-2026-24515: libexpat NULL pointer dereference in XML_ExternalEntityParserCreatelowCVSS 2.9EPSS 0.0%
- CVE-2025-59375: libexpat Expat resource exhaustion in XML parsinghighCVSS 7.5
Most severe Libexpat Project Expat vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-66046: Expat XML parser denial of service via quadratic complexityhighCVSS 7.5EPSS 0.8%
- CVE-2026-76641: Expat out-of-bounds read in XML parserhighCVSS 7.5EPSS 0.6%
- CVE-2025-59375: libexpat Expat resource exhaustion in XML parsinghighCVSS 7.5
- CVE-2026-25210: libexpat integer overflow in doContent tag buffer reallocationmediumCVSS 6.9EPSS 0.0%
- CVE-2026-56411: libexpat integer overflow in xmlwf endDoctypeDeclmediumCVSS 6.9
- CVE-2026-56410: libexpat xmlwf integer overflow in resolveSystemIdmediumCVSS 6.9
- CVE-2026-56408: libexpat integer overflow in copyStringmediumCVSS 6.9
- CVE-2026-56407: libexpat integer overflow in doProlog entity handlingmediumCVSS 6.9
- CVE-2026-56406: libexpat integer overflow in XML_ParseBuffermediumCVSS 6.9
- CVE-2026-56405: libexpat integer overflow in getAttributeIdmediumCVSS 6.9
Vulnerabilities per week
The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 29 Jun 2026 | 0 | 0 | |
| 6 Jul 2026 | 0 | 0 | |
| 13 Jul 2026 | 0 | 0 | |
| 20 Jul 2026 | 0 | 0 | |
| 27 Jul 2026 | 0 | 0 | |
| 3 Aug 2026 | 0 | 0 | |
| 10 Aug 2026 | 0 | 0 | |
| 17 Aug 2026 | 3 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 |
How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/expat.json, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "Libexpat Project Expat vulnerabilities", https://junglewise.ai/threats/technologies/expat, 26 September 2026.