🛡️ OESA-2026-2975 — expat

🟡 CVSS 5.0 — Medium ✅ No Known Exploit OSV
5.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

expat security update

expat is a stream-oriented XML parser library written in C. expat excels with files too large to fit RAM, and where performance and flexibility are crucial.

Security Fix(es):

libexpat before 2.8.2 has an integer overflow in storeAtts.(CVE-2026-56403)

libexpat before 2.8.2 has an integer overflow in addBinding.(CVE-2026-56404)

libexpat before 2.8.2 has an integer overflow in getAttributeId.(CVE-2026-56405)

libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was present in XML_Parse.(CVE-2026-56406)

libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textLen.(CVE-2026-56407)

libexpat before 2.8.2 has an integer overflow in copyString.(CVE-2026-56408)

xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used.(CVE-2026-56409)

xmlwf in libexpat before 2.8.2 has an integer overflow in resolveSystemId.(CVE-2026-56410)

xmlwf in libexpat before 2.8.2 has an integer overflow in endDoctypeDecl via NOTATION declarations.(CVE-2026-56411)

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 use-after-free can occur. NOTE: this issue exists because of an incomplete fix for CVE-2026-50219.(CVE-2026-56412)

Affected software

OESA-2026-2975 is recorded against 1 package.

  • expat (fixed in 2.5.0-23.oe2403sp1)

Timeline and source

Published on 9 July 2026 and last revised on 14 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

www.openeuler.org (Advisory)
nvd.nist.gov (Advisory)
nvd.nist.gov (Advisory)
nvd.nist.gov (Advisory)
nvd.nist.gov (Advisory)
nvd.nist.gov (Advisory)
nvd.nist.gov (Advisory)
nvd.nist.gov (Advisory)
nvd.nist.gov (Advisory)
nvd.nist.gov (Advisory)
nvd.nist.gov (Advisory)

Details

Severity MEDIUM
CVSS Score 5.0
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-07-09
Updated 2026-08-12
Modified 2026-07-14
Fix URL N/A

Affected Packages

Software From version Fixed in
expat — 2.5.0-23.oe2403sp1

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