Llibexpat project

Products

Exploited and recent CVEs

• CVE-2026-76957 Medium 4.9 libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412. 0.1%
• CVE-2026-76956 Medium 5.9 In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of s 0.3%
• CVE-2026-66046 High 7.5 Expat Denial of Service via storeAtts() Quadratic Complexity 0.7%
• CVE-2026-72522 Medium 6.2 libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode processing in the *_toUtf16 functions. 0.2%
• CVE-2026-56412 Medium 4.9 libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call depth tracking for various calls from within handlers in cases of a policy violation. Thus, a u 0.2%
• CVE-2026-56411 Medium 6.9 xmlwf in libexpat before 2.8.2 has an integer overflow in endDoctypeDecl via NOTATION declarations. 0.1%
• CVE-2026-56410 Medium 6.9 xmlwf in libexpat before 2.8.2 has an integer overflow in resolveSystemId. 0.1%
• CVE-2026-56409 Medium 6.5 xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used. 0.1%
• CVE-2026-56408 Medium 6.9 libexpat before 2.8.2 has an integer overflow in copyString. 0.1%
• CVE-2026-56407 Medium 6.9 libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textLen. 0.2%
• CVE-2026-56406 Medium 6.9 libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was present in XML_Parse. 0.2%
• CVE-2026-56405 Medium 6.9 libexpat before 2.8.2 has an integer overflow in getAttributeId. 0.1%
• CVE-2026-56404 Medium 6.9 libexpat before 2.8.2 has an integer overflow in addBinding. 0.1%
• CVE-2026-56403 Medium 6.9 libexpat before 2.8.2 has an integer overflow in storeAtts. 0.2%
• CVE-2026-56132 Medium 6.9 In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers. 0.1%
• CVE-2026-56131 Medium 4.9 libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-502 0.2%
• CVE-2026-50219 Medium 4.9 libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation. 0.2%
• CVE-2026-45186 Low 2.9 In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input. 0.5%
• CVE-2026-41080 Low 2.9 libexpat before 2.8.0 uses insufficient entropy, and thus hash flooding can occur via a crafted XML document. 0.4%
• CVE-2026-32778 Low 2.9 libexpat before 2.7.5 allows a NULL pointer dereference in the function setContext on retry after an earlier ouf-of-memory condition. 0.2%
• CVE-2026-32777 Medium 4.0 libexpat before 2.7.5 allows an infinite loop while parsing DTD content. 0.2%
• CVE-2026-32776 Medium 4.0 libexpat before 2.7.5 allows a NULL pointer dereference with empty external parameter entity content. 0.2%
• CVE-2026-25210 Medium 6.9 In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize because there is no integer overflow check for tag buffer reallocation. 0.2%
• CVE-2026-24515 Low 2.9 In libexpat before 2.7.4, XML_ExternalEntityParserCreate does not copy unknown encoding handler user data. 0.2%
• CVE-2025-66382 Low 2.9 In libexpat through 2.7.3, a crafted file with an approximate size of 2 MiB can lead to dozens of seconds of processing time. 0.2%
• CVE-2025-59375 High 7.5 libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing. 1.4%