CVE-2019-12519
CRITICAL9.8EPSS 7.5%squid - security update
Published: 4/15/2020Modified: 4/28/2026
Description
An issue was discovered in Squid through 4.7. When handling the tag esi:when when ESI is enabled, Squid calls ESIExpression::Evaluate. This function uses a fixed stack buffer to hold the expression while it's being evaluated. When processing the expression, it could either evaluate the top of the stack, or add a new member to the stack. When adding a new member, there is no check to ensure that the stack won't overflow.
Affected packages (3)
- Alpine/squidfrom 0, < 4.11-r0
- Debian/squidfrom 0, < 4.11-1
- Debian/squidfrom 0, < 4.6-1+deb10u2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |