CVE-2019-12526

An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-based buffer overflow. When receiving data from a remote server in response to an URN request, Squid fails to ensure that the response can fit within the buffer. This leads to attacker controlled data overflowing in the heap.

• CWE-787

• http://www.squid-cache.org/Advisories/SQUID-2019_7.txtThird Party Advisory
• https://bugzilla.suse.com/show_bug.cgi?id=1156326Issue Tracking, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2019/12/msg00011.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/
• https://security.gentoo.org/glsa/202003-34Third Party Advisory
• https://usn.ubuntu.com/4213-1/Third Party Advisory
• https://www.debian.org/security/2020/dsa-4682Third Party Advisory
• http://www.squid-cache.org/Advisories/SQUID-2019_7.txtThird Party Advisory
• https://bugzilla.suse.com/show_bug.cgi?id=1156326Issue Tracking, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2019/12/msg00011.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/
• https://security.gentoo.org/glsa/202003-34Third Party Advisory
• https://usn.ubuntu.com/4213-1/Third Party Advisory
• https://www.debian.org/security/2020/dsa-4682Third Party Advisory

Published

Nov 26, 2019

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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