Expat (aka libexpat) before 2.4.4 has a signed integer overflow in XML_GetBuffer, for configurations with a nonzero XML_CONTEXT_BYTES.
0.1.0+git20150808-10.1.0+git20150808-23.20.1+git20120521-63.20.1+git20120521-6build14.8.1-1ubuntu34.8.1-1ubuntu44.8.2-3.1ubuntu14.9.0-3ubuntu24.9.0-4ubuntu14.9.0-4ubuntu1.10.8.3-10.10.7-13.1.4~abc9f50+dfsg1-23.1.4~abc9f50+dfsg2-13.1.4~abc9f50+dfsg3-13.1.4~abc9f50+dfsg3-22.2.5-3ubuntu0.40.8.3-10.9.0-14.1.1+xorg4.3.0-37.3ubuntu20.10.7-10.10.7-1build1Exploitability
AV:NAC:LPR:NUI:NScope
S:UImpact
C:HI:HA:HCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H