CVE-2019-12526

Name: CVE-2019-12526
Creator: NVD / NIST
Published: 2019-11-26T17:15:10.843+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 20.25%

Last modified Jun 17, 2026

CVE-2019-12526 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-based buffer overflow. EPSS estimates a 20.25% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

20.25%

97.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Squid-Cache	Squid	>= 3.0, <= 3.5.28
Squid-Cache	Squid	>= 4.0, <= 4.8
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	19.04
Canonical	Ubuntu Linux	19.10
Fedoraproject	Fedora	30
Fedoraproject	Fedora	31
Opensuse	Leap	15.0
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0

References

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

Timeline

Published: Nov 26, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-12526?

How severe is CVE-2019-12526?

CVE-2019-12526 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 20.25% probability of exploitation in the next 30 days.

How do I fix CVE-2019-12526?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-12526?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST