HOMEVULNERABILITIESCVE-2026-33515
MEDIUM

CVE-2026-33515

CWE-125Published: March 26, 2026· Updated: Mar 31, 2026

6.5
CVSS v3.1
EPSS:0.96%probability of exploitation in 30 daysPercentile:76.4th

Official 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 queries using `icp_access` rules. Version 7.5 contains a patch.

NVD Source

Technical Analysis

CVE-2026-33515 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected Vendors & Products

squid-cache1 product
squid
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/squid-cache/squid/commit/8138e909d2058d4401e0ad49b583afaec912b165
ADVISORYhttps://github.com/squid-cache/squid/security/advisories/GHSA-84p4-hcx7-jj7c
ADVISORYhttp://www.openwall.com/lists/oss-security/2026/03/25/4

All References (5)

→
https://github.com/squid-cache/squid/commit/8138e909d2058d4401e0ad49b583afaec912b165Patch
→
https://github.com/squid-cache/squid/pull/2220Issue Tracking
→
https://github.com/squid-cache/squid/pull/2220#discussion_r2727683637Issue Tracking
→
https://github.com/squid-cache/squid/security/advisories/GHSA-84p4-hcx7-jj7cVendor Advisory
→
http://www.openwall.com/lists/oss-security/2026/03/25/4Third Party Advisory · Mailing List

Quick Facts

CVE IDCVE-2026-33515
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-125
CISA KEVNo
EPSS (30d)0.96%
Affected1 vendor
PublishedMar 26, 2026

Related CVEs (CWE-125)

CVE-2026-34987
9.9
CVE-2026-24213
9.8
CVE-2026-42799
9.8
CVE-2025-15646
9.8
CVE-2026-33642
9.8
CVE-2026-3916
9.6

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-33515 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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