# Libexpat Project vulnerabilities Source: https://junglewise.ai/threats/vendors/libexpat-project Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/vendors/libexpat-project.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 29 vulnerabilities in Libexpat Project: 0 in the last 7 days and 3 in the last 90 days, 3 of them critical and 0 exploited in the wild. The most recent, CVE-2026-76957, was published on 20 August 2026. Nothing was published in the last eight weeks. 2 technologies have a page of their own. ## Counts - Last 7 days: 0 - Last 30 days: 0 - Last 90 days: 3 - All time: 29 (3 critical, 0 exploited in the wild) ## About Libexpat Project Project that develops and maintains the Expat XML parser library. ## Latest Libexpat Project vulnerabilities - [CVE-2026-76957: libexpat use-after-free in custom encoding callbacks](https://junglewise.ai/threats/cve-2026-76957-libexpat-use-after-free-in-custom-encoding-callbacks) (medium, CVSS 4.9, published 20 Aug 2026) - [CVE-2026-76956: libexpat hash flooding denial of service via mishandled entropy generation](https://junglewise.ai/threats/cve-2026-76956-libexpat-hash-flooding-denial-of-service-via-mishandled-entropy) (medium, CVSS 5.9, published 20 Aug 2026) - [CVE-2026-66046: Expat XML parser denial of service via quadratic complexity](https://junglewise.ai/threats/cve-2026-66046-expat-xml-parser-denial-of-service-via-quadratic-complexity) (high, CVSS 7.5, published 18 Aug 2026) - [CVE-2026-56412: libexpat use-after-free in doCdataSection](https://junglewise.ai/threats/cve-2026-56412-libexpat-use-after-free-in-docdatasection) (medium, CVSS 4.9, published 21 Jun 2026) - [CVE-2026-56411: libexpat integer overflow in xmlwf endDoctypeDecl](https://junglewise.ai/threats/cve-2026-56411-libexpat-integer-overflow-in-xmlwf-enddoctypedecl) (medium, CVSS 6.9, published 21 Jun 2026) - [CVE-2026-56410: libexpat xmlwf integer overflow in resolveSystemId](https://junglewise.ai/threats/cve-2026-56410-libexpat-xmlwf-integer-overflow-in-resolvesystemid) (medium, CVSS 6.9, published 21 Jun 2026) - [CVE-2026-56409: libexpat xmlwf integer overflow in output filename handling](https://junglewise.ai/threats/cve-2026-56409-libexpat-xmlwf-integer-overflow-in-output-filename-handling) (medium, CVSS 6.5, published 21 Jun 2026) - [CVE-2026-56408: libexpat integer overflow in copyString](https://junglewise.ai/threats/cve-2026-56408-libexpat-integer-overflow-in-copystring) (medium, CVSS 6.9, published 21 Jun 2026) - [CVE-2026-56407: libexpat integer overflow in doProlog entity handling](https://junglewise.ai/threats/cve-2026-56407-libexpat-integer-overflow-in-doprolog-entity-handling) (medium, CVSS 6.9, published 21 Jun 2026) - [CVE-2026-56406: libexpat integer overflow in XML_ParseBuffer](https://junglewise.ai/threats/cve-2026-56406-libexpat-integer-overflow-in-xml-parsebuffer) (medium, CVSS 6.9, published 21 Jun 2026) - [CVE-2026-56405: libexpat integer overflow in getAttributeId](https://junglewise.ai/threats/cve-2026-56405-libexpat-integer-overflow-in-getattributeid) (medium, CVSS 6.9, published 21 Jun 2026) - [CVE-2026-56404: libexpat integer overflow in addBinding](https://junglewise.ai/threats/cve-2026-56404-libexpat-integer-overflow-in-addbinding) (medium, CVSS 6.9, published 21 Jun 2026) - [CVE-2026-56403: libexpat integer overflow in storeAtts](https://junglewise.ai/threats/cve-2026-56403-libexpat-integer-overflow-in-storeatts) (medium, CVSS 6.9, published 21 Jun 2026) - [CVE-2026-56132: libexpat heap buffer overflow in doProlog](https://junglewise.ai/threats/cve-2026-56132-libexpat-heap-buffer-overflow-in-doprolog) (medium, CVSS 6.9, published 19 Jun 2026) - [CVE-2026-56131: libexpat use-after-free in XML_ResumeParser](https://junglewise.ai/threats/cve-2026-56131-libexpat-use-after-free-in-xml-resumeparser) (medium, CVSS 4.9, published 19 Jun 2026) - [CVE-2026-50219: libexpat use-after-free via insufficient handler call depth tracking](https://junglewise.ai/threats/cve-2026-50219-libexpat-use-after-free-via-insufficient-handler-call-depth) (medium, CVSS 4.9, published 4 Jun 2026) - [CVE-2026-7210: Python CPython denial of service in XML parsers](https://junglewise.ai/threats/cve-2026-7210-python-cpython-denial-of-service-in-xml-parsers) (critical, CVSS 9.8, published 11 May 2026) - [CVE-2026-45186: libexpat denial of service via attribute name collision check](https://junglewise.ai/threats/cve-2026-45186-libexpat-denial-of-service-via-attribute-name-collision-check) (low, CVSS 2.9, published 10 May 2026) - [CVE-2026-41080: libexpat insufficient entropy for hash salt in XML parsing](https://junglewise.ai/threats/cve-2026-41080-libexpat-insufficient-entropy-for-hash-salt-in-xml-parsing) (low, CVSS 2.9, published 16 Apr 2026) - [CVE-2026-32778: libexpat NULL pointer dereference in setContext function](https://junglewise.ai/threats/cve-2026-32778-libexpat-null-pointer-dereference-in-setcontext-function) (low, CVSS 2.9, published 16 Mar 2026) - [CVE-2026-32777: libexpat infinite loop in entityValueProcessor during DTD parsing](https://junglewise.ai/threats/cve-2026-32777-libexpat-infinite-loop-in-entityvalueprocessor-during-dtd-parsing) (medium, CVSS 4, published 16 Mar 2026) - [CVE-2026-32776: libexpat NULL pointer dereference in XML entity parsing](https://junglewise.ai/threats/cve-2026-32776-libexpat-null-pointer-dereference-in-xml-entity-parsing) (medium, CVSS 4, published 16 Mar 2026) - [CVE-2026-25210: libexpat integer overflow in doContent tag buffer reallocation](https://junglewise.ai/threats/cve-2026-25210-libexpat-integer-overflow-in-docontent-tag-buffer-reallocation) (medium, CVSS 6.9, published 30 Jan 2026) - [CVE-2026-24515: libexpat NULL pointer dereference in XML_ExternalEntityParserCreate](https://junglewise.ai/threats/cve-2026-24515-libexpat-null-pointer-dereference-in-xml) (low, CVSS 2.9, published 23 Jan 2026) - [CVE-2025-66382: libexpat inefficient algorithmic complexity denial of service](https://junglewise.ai/threats/cve-2025-66382-libexpat-inefficient-algorithmic-complexity-denial-of-service) (low, CVSS 2.9, published 28 Nov 2025) ## Most severe Libexpat Project vulnerabilities - [CVE-2026-7210: Python CPython denial of service in XML parsers](https://junglewise.ai/threats/cve-2026-7210-python-cpython-denial-of-service-in-xml-parsers) (critical, CVSS 9.8, published 11 May 2026) - [CVE-2024-45492: libexpat integer overflow in nextScaffoldPart](https://junglewise.ai/threats/cve-2024-45492-libexpat-integer-overflow-in-nextscaffoldpart) (critical, CVSS 9.8, published 30 Aug 2024) - [CVE-2024-45491: libexpat integer overflow in dtdCopy function](https://junglewise.ai/threats/cve-2024-45491-libexpat-integer-overflow-in-dtdcopy-function) (critical, CVSS 9.8, published 30 Aug 2024) - [CVE-2026-66046: Expat XML parser denial of service via quadratic complexity](https://junglewise.ai/threats/cve-2026-66046-expat-xml-parser-denial-of-service-via-quadratic-complexity) (high, CVSS 7.5, published 18 Aug 2026) - [CVE-2025-59375: libexpat Expat resource exhaustion in XML parsing](https://junglewise.ai/threats/cve-2025-59375-libexpat-expat-resource-exhaustion-in-xml-parsing) (high, CVSS 7.5, published 15 Sep 2025) - [CVE-2024-45490: libexpat integer overflow in XML_ParseBuffer](https://junglewise.ai/threats/cve-2024-45490-libexpat-integer-overflow-in-xml-parsebuffer) (high, CVSS 7.5, published 30 Aug 2024) - [CVE-2026-25210: libexpat integer overflow in doContent tag buffer reallocation](https://junglewise.ai/threats/cve-2026-25210-libexpat-integer-overflow-in-docontent-tag-buffer-reallocation) (medium, CVSS 6.9, published 30 Jan 2026) - [CVE-2026-56411: libexpat integer overflow in xmlwf endDoctypeDecl](https://junglewise.ai/threats/cve-2026-56411-libexpat-integer-overflow-in-xmlwf-enddoctypedecl) (medium, CVSS 6.9, published 21 Jun 2026) - [CVE-2026-56410: libexpat xmlwf integer overflow in resolveSystemId](https://junglewise.ai/threats/cve-2026-56410-libexpat-xmlwf-integer-overflow-in-resolvesystemid) (medium, CVSS 6.9, published 21 Jun 2026) - [CVE-2026-56408: libexpat integer overflow in copyString](https://junglewise.ai/threats/cve-2026-56408-libexpat-integer-overflow-in-copystring) (medium, CVSS 6.9, published 21 Jun 2026) ## Vulnerabilities per week Nothing was published in the last eight weeks. | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 3 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 0 | 0 | 0 | | 19 Oct 2026 | 0 | 0 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 0 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Libexpat Project technologies - [Libexpat Project Libexpat](https://junglewise.ai/threats/technologies/libexpat): 30 vulnerabilities - [Libexpat Project Expat](https://junglewise.ai/threats/technologies/expat): 22 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Libexpat Project vulnerabilities", https://junglewise.ai/threats/vendors/libexpat-project, 9 November 2026.