CVE-2026-50012: Squid is a caching proxy for the Web

Q: How do I fix CVE-2026-50012?

squid: upgrade to 7.6. Exact commands for each OS are on this page.

Q: Is CVE-2026-50012 being exploited?

CVE-2026-50012 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-50012 affect?

CVE-2026-50012 affects squid. Severity is medium (CVSS 5.5). Squid is a caching proxy for the Web. Prior to 7.6, due to an improper input validation bug in cache digest reply handling (peerDigestSwapInMask in src/peer_digest.cc), Squid is vulnerable to a heap-based buffer overflow: a cache digest's o

Q: How urgent is CVE-2026-50012?

Priority 37/100. No elevated risk signals yet.

Routine

MEDIUM 5.5UPGRADE

CVE-2026-50012 is a medium-severity flaw (CVSS 5.5) affecting squid. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Squid is a caching proxy for the Web. Prior to 7.6, due to an improper input validation bug in cache digest reply handling (peerDigestSwapInMask in src/peer_digest.cc), Squid is vulnerable to a heap-based buffer overflow: a cache digest's on-the-wire size may be larger than the mask_size declared within the digest, so a trusted peer sending a maliciously crafted reply to a cache_digest request message can trigger the overflow. This attack is limi

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-20, CWE-122
Published	2026-07-16
Last modified	2026-10-24

Publisher (CNA): GitHub, Inc. · Vendor: squid-cache

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-16 17:16 UTCPublished CVE record published
2026-10-24 20:10 UTCUpdated Record last modified

squid-cache squid UPGRADE

Affected: < 7.6

Fixed in: 7.6

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy squid || rpm -q squid || squid --version

2. UPGRADE to 7.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade squid

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade squid

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-50012?

squid: upgrade to 7.6. Exact commands for each OS are on this page.

Is CVE-2026-50012 being exploited?

CVE-2026-50012 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-50012 affect?

CVE-2026-50012 affects squid. Severity is medium (CVSS 5.5). Squid is a caching proxy for the Web. Prior to 7.6, due to an improper input validation bug in cache digest reply handling (peerDigestSwapInMask in src/peer_digest.cc), Squid is vulnerable to a heap-based buffer overflow: a cache digest's o

How urgent is CVE-2026-50012?

Priority 37/100. No elevated risk signals yet.

Software pages

Squid vulnerabilities

Related CVEs

CVE-2026-47729 MEDIUM 6.5 UPGRADE Squid is a caching proxy for the Web

References

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