CVE-2026-33515 — Out-of-bounds Read in Squid

CWE-125 — Out-of-bounds ReadCWE-1289 — Improper Validation of Unsafe Equivalence in Input8 documents8 sources
Severity
6.9MEDIUMNVD
EPSS
0.2%
top 63.97%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Squid-cache SquidSquid
Timeline
PublishedMar 26
Latest updateApr 8

Description

Squid is a caching proxy for the Web. Prior to version 7.5, due to improper input validation, Squid is vulnerable to out of bounds read when handling ICP traffic. This problem allows a remote attacker to receive small amounts of memory potentially containing sensitive information when responding with errors to invalid ICP requests. This attack is limited to Squid deployments that explicitly enable ICP support (i.e. configure non-zero `icp_port`). This problem cannot be mitigated by denying ICP q…

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N

Affected Packages3 packages

▶CVEListV5squid-cache/squid< 7.5
▶Debiansquid/squid< 7.5-1

Patches

Patch: github.com ↗

🔴Vulnerability Details

2
CVEList
Squid has issues in ICP message handling↗2026-03-26
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OSV
CVE-2026-33515: Squid is a caching proxy for the Web↗2026-03-26
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📋Vendor Advisories

4
Ubuntu
Squid vulnerabilities↗2026-04-08
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Red Hat
Squid: Squid: Information disclosure via improper input validation in ICP traffic↗2026-03-26
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Microsoft
Squid has issues in ICP message handling↗2026-03-10
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Debian
CVE-2026-33515: squid - Squid is a caching proxy for the Web. Prior to version 7.5, due to improper inpu...↗2026
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🕵️Threat Intelligence

1
Wiz
CVE-2026-33515 Impact, Exploitability, and Mitigation Steps | Wiz↗
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