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NVD / CVE Program· CNA GitHub_M

CVE-2026-50012: Squid: Memory corruption in cache_digest reply handling

MediumCVSS 5.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.3% (FIRST EPSS); higher than 72.1% of all records.
  • Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: squid-cache squid 7.6; azl3 squid 6.13-4 on Azure Linux 3.0 6.13-5; azl3 squid 6.13-5 on Azure Linux 3.0 6.13-5.

Low priority for now. Upgrade to squid-cache squid 7.6; azl3 squid 6.13-4 on Azure Linux 3.0 6.13-5; azl3 squid 6.13-5 on Azure Linux 3.0 6.13-5 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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 limited to Squid instances compiled with the --enable-cache-digests option and configured with cache_peer entries. This issue is fixed in version 7.6.

Published
Jul 16, 2026
Updated
Oct 24, 2026
EPSS
1.3% · 72th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · GitHub_M
5.5
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-50012

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
squid-cachesquid

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • squid-cache squid

    • < 7.6affected

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • squid-cache squidbefore 7.6

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.23squidbefore 7.6-r07.6-r0
Debian:12squidbefore 5.7-2+deb12u65.7-2+deb12u6
Debian:13squidbefore 6.13-2+deb13u26.13-2+deb13u2
Debian:14squidbefore 7.6-17.6-1
openSUSE:Leap 16.0squidbefore 6.14-160000.1.16.14-160000.1.1
openSUSE:Tumbleweedsquidbefore 7.7-2.17.7-2.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSsquidbefore 5.7-150400.3.41.15.7-150400.3.41.1
SUSE:Linux Enterprise Module for Server Applications 15 SP7squidbefore 6.14-150600.3.20.16.14-150600.3.20.1
SUSE:Linux Enterprise Server 16.0squidbefore 6.14-160000.1.16.14-160000.1.1

Same product

squid-cache: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-25617Denial of Service in HTTP Header parser in squid proxy
    56Plan
  • CVE-2023-49285Denial of Service in HTTP Message Processing in Squid
    56Plan
  • CVE-2021-31806An issue was discovered in Squid before 4.15 and 5.x before 5.0.6.
    55Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-33526Mar 25, 2026 · Squid vulnerable to Denial of Service in ICP Request handling
    39Monitor
  • ← EarlierCVE-2026-47729Jul 16, 2026 · Squid: Memory disclosure in FTP gateway
    26Monitor
  • Later →CVE-2026-61642Oct 13, 2026 · Squid Request Smuggling in HTTP Transfer-Encoding
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
squid-cache squid7.6 · descriptionVendor (CNA)
azl3 squid 6.13-4 on Azure Linux 3.06.13-5 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 squid 6.13-5 on Azure Linux 3.06.13-5 · CBL-Mariner ReleasesMicrosoft (MSRC)
alpine:squid7.6-r0 · Alpine:v3.23Package registry (OSV)
debian:squid5.7-2+deb12u6 · Debian:12Package registry (OSV)
opensuse:squid7.7-2.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:squid6.14-150600.3.20.1 · SUSE:Linux Enterprise Module for Server Applications 15 SP7Package registry (OSV)
suse:squid6.14-160000.1.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days-1% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Not on record for this CVE: researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • Administrator privileges are required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
low · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
High

Weakness class (CWE)

CWE-20 · Improper Input Validation

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records