CVE-2019-12526: canonical ubuntu_linux Out-of-bounds Write
Vulnerability summary
CVE-2019-12526 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in canonical ubuntu_linux. EPSS estimates a 20.25% chance of exploitation in the next 30 days, higher than 97.4% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 13 · Related 8Timeline
- 26-11-2019PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
20.25%
Chance of exploitation in the next 30 days
Percentile
97%
Versus all other CVEs
30-day change
0.00 pp
From 20.25% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian2 products
- squid< 4.9-1
- debian_linuxEOL8.0 | 9.0 | 10.0
Ubuntu2 products
- squid< 4.9-2ubuntu1
- squid3< 3.5.12-1ubuntu7.9 | < 3.5.27-1ubuntu1.4
Canonical1 product
- ubuntu_linuxEOL16.04 | 18.04 | 19.04 | 19.10
Fedoraproject1 product
- fedoraEOL30 | 31
Opensuse1 product
- leapEOL15.0
Squid-cache1 product
- squid≥ 3.0, ≤ 3.5.28 | ≥ 4.0, ≤ 4.8
6 vendors · 8 products
References
13 links
lists.debian.org/debian-lts-announce/2019/12/msg00011.htmlMailing ListX Refsource MLISTThird Party Advisory- lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing ListX Refsource MLISTThird Party Advisory