libexpat before 2.7.5 allows a NULL pointer dereference in the function setContext on retry after an earlier ouf-of-memory condition.
https://www.cisa.gov/news-events/ics-advisories/icsa-26-155-04
https://github.com/libexpat/libexpat/pull/1163
https://github.com/libexpat/libexpat/pull/1159
https://cert-portal.siemens.com/productcert/html/ssa-082556.html