CVE catalog

CVE-2019-12522

squid: CVE-2019-12522

Severity: Low
Published: Apr 15, 2020, 7:15:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.34% · Oct 25, 2026

An issue was discovered in Squid through 4.7. When Squid is run as root, it spawns its child processes as a lesser user, by default the user nobody. This is done via the leave_suid call. leave_suid leaves the Saved UID as 0. This makes it trivial for an attacker who has compromised the child process to escalate their privileges back to root.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	squid	sid	`7.7-1`	vulnerable
Debian	squid	forky	`7.7-1`	vulnerable
Debian	squid	trixie	`6.13-2+deb13u3`	vulnerable
Debian	squid	trixie-security	`6.13-2+deb13u2`	vulnerable
Debian	squid	bookworm	`5.7-2+deb12u5`	vulnerable
Debian	squid	bookworm-security	`5.7-2+deb12u6`	vulnerable
Ubuntu	squid3	pro	`3.5.23-5ubuntu1`	vulnerable
Ubuntu	squid3	pro	`3.5.23-5ubuntu2`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.1`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.2`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.3`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.4`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.5`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.6`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.7`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.8`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.9`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.10`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.11`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.12`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.13`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.14`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.14+esm1`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.14+esm2`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.14+esm3`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.14+esm4`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.14+esm5`	vulnerable
Ubuntu	squid3	pro	`3.5.27-1ubuntu1.14+esm6`	vulnerable
Ubuntu	squid	pro	`4.8-1ubuntu2`	vulnerable
Ubuntu	squid	pro	`4.8-1ubuntu3`	vulnerable
Ubuntu	squid	pro	`4.9-2ubuntu1`	vulnerable
Ubuntu	squid	pro	`4.9-2ubuntu2`	vulnerable
Ubuntu	squid	pro	`4.9-2ubuntu3`	vulnerable
Ubuntu	squid	pro	`4.9-2ubuntu4`	vulnerable
Ubuntu	squid	pro	`4.10-1ubuntu1`	vulnerable
Ubuntu	squid	pro	`4.10-1ubuntu1.1`	vulnerable
Ubuntu	squid	pro	`4.10-1ubuntu1.2`	vulnerable
Ubuntu	squid	pro	`4.10-1ubuntu1.3`	vulnerable
Ubuntu	squid	pro	`4.10-1ubuntu1.4`	vulnerable
Ubuntu	squid	pro	`4.10-1ubuntu1.5`	vulnerable
Ubuntu	squid	pro	`4.10-1ubuntu1.6`	vulnerable
Ubuntu	squid	pro	`4.10-1ubuntu1.7`	vulnerable
Ubuntu	squid	pro	`4.10-1ubuntu1.8`	vulnerable
Ubuntu	squid	pro	`4.10-1ubuntu1.9`	vulnerable
Ubuntu	squid	pro	`4.10-1ubuntu1.10`	vulnerable
Ubuntu	squid	pro	`4.10-1ubuntu1.11`	vulnerable
Ubuntu	squid	pro	`4.10-1ubuntu1.12`	vulnerable
Ubuntu	squid	pro	`4.10-1ubuntu1.13`	vulnerable
Ubuntu	squid	pro	`4.10-1ubuntu1.13+esm1`	vulnerable
Ubuntu	squid	pro	`4.10-1ubuntu1.13+esm2`	vulnerable
Ubuntu	squid	pro	`4.10-1ubuntu1.13+esm3`	vulnerable
Ubuntu	squid	22.04	`4.13-10ubuntu5`	vulnerable
Ubuntu	squid	22.04	`5.2-1ubuntu1`	vulnerable
Ubuntu	squid	22.04	`5.2-1ubuntu3`	vulnerable
Ubuntu	squid	22.04	`5.2-1ubuntu4`	vulnerable
Ubuntu	squid	22.04	`5.2-1ubuntu4.1`	vulnerable
Ubuntu	squid	22.04	`5.2-1ubuntu4.2`	vulnerable
Ubuntu	squid	22.04	`5.2-1ubuntu4.3`	vulnerable
Ubuntu	squid	22.04	`5.7-0ubuntu0.22.04.1`	vulnerable
Ubuntu	squid	22.04	`5.7-0ubuntu0.22.04.2`	vulnerable
Ubuntu	squid	22.04	`5.7-0ubuntu0.22.04.3`	vulnerable
Ubuntu	squid	22.04	`5.7-0ubuntu0.22.04.4`	vulnerable
Ubuntu	squid	22.04	`5.9-0ubuntu0.22.04.1`	vulnerable
Ubuntu	squid	22.04	`5.9-0ubuntu0.22.04.2`	vulnerable
Ubuntu	squid	22.04	`5.9-0ubuntu0.22.04.3`	vulnerable
Ubuntu	squid	22.04	`5.9-0ubuntu0.22.04.4`	vulnerable
Ubuntu	squid	22.04	`5.9-0ubuntu0.22.04.5`	vulnerable
Ubuntu	squid	22.04	`5.9-0ubuntu0.22.04.7`	vulnerable
Ubuntu	squid	22.04	`5.9-0ubuntu0.22.04.8`	vulnerable
Ubuntu	squid	24.04	`6.1-2ubuntu1`	vulnerable
Ubuntu	squid	24.04	`6.1-2ubuntu2`	vulnerable
Ubuntu	squid	24.04	`6.5-1ubuntu1`	vulnerable
Ubuntu	squid	24.04	`6.5-1ubuntu2`	vulnerable
Ubuntu	squid	24.04	`6.5-1ubuntu3`	vulnerable
Ubuntu	squid	24.04	`6.6-1ubuntu4`	vulnerable
Ubuntu	squid	24.04	`6.6-1ubuntu5`	vulnerable
Ubuntu	squid	24.04	`6.6-1ubuntu5.1`	vulnerable
Ubuntu	squid	24.04	`6.10-0ubuntu0.24.04.1`	vulnerable
Ubuntu	squid	24.04	`6.13-0ubuntu0.24.04.1`	vulnerable
Ubuntu	squid	24.04	`6.13-0ubuntu0.24.04.2`	vulnerable
Ubuntu	squid	24.04	`6.13-0ubuntu0.24.04.3`	vulnerable
Ubuntu	squid	24.04	`6.14-0ubuntu0.24.04.1`	vulnerable
Ubuntu	squid	24.04	`6.14-0ubuntu0.24.04.2`	vulnerable
Ubuntu	squid	24.04	`6.14-0ubuntu0.24.04.4`	vulnerable
Ubuntu	squid	24.04	`6.14-0ubuntu0.24.04.5`	vulnerable
Ubuntu	squid	25.10	`6.13-1ubuntu1`	vulnerable
Ubuntu	squid	25.10	`6.13-1ubuntu2`	vulnerable
Ubuntu	squid	25.10	`6.13-1ubuntu3`	vulnerable
Ubuntu	squid	25.10	`6.13-1ubuntu4`	vulnerable
Ubuntu	squid	25.10	`6.13-1ubuntu4.1`	vulnerable
Ubuntu	squid	25.10	`6.14-0ubuntu0.25.10.1`	vulnerable
Ubuntu	squid	25.10	`6.14-0ubuntu0.25.10.2`	vulnerable
Ubuntu	squid	25.10	`6.14-0ubuntu0.25.10.4`	vulnerable
Ubuntu	squid	26.10	`7.2-2ubuntu2`	vulnerable
Ubuntu	squid	26.10	`7.6-2ubuntu1`	vulnerable
Ubuntu	squid	26.10	`7.6-2ubuntu3`	vulnerable
Ubuntu	squid	26.10	`7.7-1ubuntu1`	vulnerable
Ubuntu	squid	26.04	`6.13-1ubuntu4`	vulnerable
Ubuntu	squid	26.04	`6.13-1ubuntu5`	vulnerable
Ubuntu	squid	26.04	`7.2-2ubuntu1`	vulnerable
Ubuntu	squid	26.04	`7.2-2ubuntu2`	vulnerable
Ubuntu	squid	26.04	`7.2-2ubuntu2.2`	vulnerable
Ubuntu	squid	26.04	`7.7-0ubuntu0.26.04.1`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	squid	source	sid	`(unfixed)`	unimportant	Not reported	Not reported
Debian	squid	source	forky	`(unfixed)`	unimportant	Not reported	Not reported
Debian	squid	source	trixie	`(unfixed)`	unimportant	Not reported	Not reported
Debian	squid	source	bookworm	`(unfixed)`	unimportant	Not reported	Not reported

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[squid]Unknown
Details (4)
- 5.7-2+deb12u5 · amd64 · bookworm
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
- 5.7-2+deb12u5 · arm64 · bookworm
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
- 5.7-2+deb12u6 · amd64 · bookworm-security
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
- 5.7-2+deb12u6 · arm64 · bookworm-security
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
[squid-cgi]Unknown
Source package: [squid]
Details (4)
- 5.7-2+deb12u5 · amd64 · bookworm
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
- 5.7-2+deb12u5 · arm64 · bookworm
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
- 5.7-2+deb12u6 · amd64 · bookworm-security
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
- 5.7-2+deb12u6 · arm64 · bookworm-security
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
[squidclient]Unknown
Source package: [squid]
Details (4)
- 5.7-2+deb12u5 · amd64 · bookworm
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
- 5.7-2+deb12u5 · arm64 · bookworm
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
- 5.7-2+deb12u6 · amd64 · bookworm-security
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
- 5.7-2+deb12u6 · arm64 · bookworm-security
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
[squid-common]Unknown
Source package: [squid]
Details (4)
- 5.7-2+deb12u5 · all · bookworm
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
- 5.7-2+deb12u5 · all · bookworm
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
- 5.7-2+deb12u6 · all · bookworm-security
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
- 5.7-2+deb12u6 · all · bookworm-security
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
[squid-openssl]Unknown
Source package: [squid]
Details (4)
- 5.7-2+deb12u5 · amd64 · bookworm
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
- 5.7-2+deb12u5 · arm64 · bookworm
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
- 5.7-2+deb12u6 · amd64 · bookworm-security
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
- 5.7-2+deb12u6 · arm64 · bookworm-security
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
[squid-purge]Unknown
Source package: [squid]
Details (4)
- 5.7-2+deb12u5 · amd64 · bookworm
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
- 5.7-2+deb12u5 · arm64 · bookworm
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
- 5.7-2+deb12u6 · amd64 · bookworm-security
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12
- 5.7-2+deb12u6 · arm64 · bookworm-security
  Affected
  dsa · squid · debian · bookworm; dsa · squid · debian · 12

[Debian 13 (Trixie)]

[squid]Unknown
Details (4)
- 6.13-2+deb13u2 · amd64 · trixie
  Affected
  dsa · squid · debian · 13
- 6.13-2+deb13u2 · arm64 · trixie
  Affected
  dsa · squid · debian · 13
- 6.13-2+deb13u2 · amd64 · trixie-security
  Affected
  dsa · squid · debian · 13
- 6.13-2+deb13u2 · arm64 · trixie-security
  Affected
  dsa · squid · debian · 13
[squid-cgi]Unknown
Source package: [squid]
Details (4)
- 6.13-2+deb13u2 · amd64 · trixie
  Affected
  dsa · squid · debian · 13
- 6.13-2+deb13u2 · arm64 · trixie
  Affected
  dsa · squid · debian · 13
- 6.13-2+deb13u2 · amd64 · trixie-security
  Affected
  dsa · squid · debian · 13
- 6.13-2+deb13u2 · arm64 · trixie-security
  Affected
  dsa · squid · debian · 13
[squidclient]Unknown
Source package: [squid]
Details (4)
- 6.13-2+deb13u2 · amd64 · trixie
  Affected
  dsa · squid · debian · 13
- 6.13-2+deb13u2 · arm64 · trixie
  Affected
  dsa · squid · debian · 13
- 6.13-2+deb13u2 · amd64 · trixie-security
  Affected
  dsa · squid · debian · 13
- 6.13-2+deb13u2 · arm64 · trixie-security
  Affected
  dsa · squid · debian · 13
[squid-common]Unknown
Source package: [squid]
Details (4)
- 6.13-2+deb13u2 · all · trixie
  Affected
  dsa · squid · debian · 13
- 6.13-2+deb13u2 · all · trixie
  Affected
  dsa · squid · debian · 13
- 6.13-2+deb13u2 · all · trixie-security
  Affected
  dsa · squid · debian · 13
- 6.13-2+deb13u2 · all · trixie-security
  Affected
  dsa · squid · debian · 13
[squid-openssl]Unknown
Source package: [squid]
Details (4)
- 6.13-2+deb13u2 · amd64 · trixie
  Affected
  dsa · squid · debian · 13
- 6.13-2+deb13u2 · arm64 · trixie
  Affected
  dsa · squid · debian · 13
- 6.13-2+deb13u2 · amd64 · trixie-security
  Affected
  dsa · squid · debian · 13
- 6.13-2+deb13u2 · arm64 · trixie-security
  Affected
  dsa · squid · debian · 13
[squid-purge]Unknown
Source package: [squid]
Details (4)
- 6.13-2+deb13u2 · amd64 · trixie
  Affected
  dsa · squid · debian · 13
- 6.13-2+deb13u2 · arm64 · trixie
  Affected
  dsa · squid · debian · 13
- 6.13-2+deb13u2 · amd64 · trixie-security
  Affected
  dsa · squid · debian · 13
- 6.13-2+deb13u2 · arm64 · trixie-security
  Affected
  dsa · squid · debian · 13

Observed: Oct 23, 2026, 5:39:42 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]