CVE-2021-45960

In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) places in the storeAtts function in xmlparse.c can lead to realloc misbehavior (e.g., allocating too few bytes, or only freeing memory).

• CWE-682
• CWE-682

• http://www.openwall.com/lists/oss-security/2022/01/17/3Exploit, Mailing List, Third Party Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1217609Issue Tracking, Permissions Required, Third Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfPatch, Third Party Advisory
• https://github.com/libexpat/libexpat/issues/531Exploit, Issue Tracking, Patch, Third Party Advisory
• https://github.com/libexpat/libexpat/pull/534Patch, Third Party Advisory
• https://security.gentoo.org/glsa/202209-24Third Party Advisory
• https://security.netapp.com/advisory/ntap-20220121-0004/Third Party Advisory
• https://www.debian.org/security/2022/dsa-5073Issue Tracking, Third Party Advisory
• https://www.tenable.com/security/tns-2022-05Third Party Advisory
• http://www.openwall.com/lists/oss-security/2022/01/17/3Exploit, Mailing List, Third Party Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1217609Issue Tracking, Permissions Required, Third Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfPatch, Third Party Advisory
• https://github.com/libexpat/libexpat/issues/531Exploit, Issue Tracking, Patch, Third Party Advisory
• https://github.com/libexpat/libexpat/pull/534Patch, Third Party Advisory
• https://security.gentoo.org/glsa/202209-24Third Party Advisory
• https://security.netapp.com/advisory/ntap-20220121-0004/Third Party Advisory
• https://www.debian.org/security/2022/dsa-5073Issue Tracking, Third Party Advisory
• https://www.tenable.com/security/tns-2022-05Third Party Advisory

Published

Jan 1, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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