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Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process. libexpat before commit 13c5f63 contains a heap buffer over-read vulnerability in xmlparse.c. XML_ParseBuffer advances the parse buffer end with parser->m_bufferEnd += len using a caller-supplied length that is not validated against the allocated buffer size, so repeated XML_ParseBuffer calls move m_bufferEnd past the end of the heap allocation and subsequent parsing reads out of bounds. Reaching this path requires a parse buffer to already be present; otherwise XML_ParseBuffer returns XML_ERROR_NO_BUFFER. A buffer is present after a prior call to XML_GetBuffer, either directly (the common case) or indirectly through a prior XML_Parse call that allocates the buffer internally. The over-read discloses adjacent heap memory to the calling application, recovering heap pointers, libc function pointers, and code pointers sufficient to defeat ASLR and build further exploitation primitives.
FEDORA-2026-86ef30a678 (mingw-expat-2.9.0-1.fc44) has been submitted as an update to Fedora 44. https://bodhi.fedoraproject.org/updates/FEDORA-2026-86ef30a678
FEDORA-2026-3c5a339682 (mingw-expat-2.9.0-1.fc45) has been submitted as an update to Fedora 45. https://bodhi.fedoraproject.org/updates/FEDORA-2026-3c5a339682
FEDORA-2026-86ef30a678 has been pushed to the Fedora 44 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-86ef30a678` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-86ef30a678 See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-2026-3c5a339682 has been pushed to the Fedora 45 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-3c5a339682` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-3c5a339682 See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
This package has changed maintainer in Fedora. Reassigning to the new maintainer of this component.
FEDORA-2026-3c5a339682 (mingw-expat-2.9.0-1.fc45) has been pushed to the Fedora 45 stable repository. If problem still persists, please make note of it in this bug report.
FEDORA-2026-86ef30a678 (mingw-expat-2.9.0-1.fc44) has been pushed to the Fedora 44 stable repository. If problem still persists, please make note of it in this bug report.