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CVE-2026-47729· NVD / CVE Program· CNA GitHub_M

Squid: Memory disclosure in FTP gateway

Noroxi assessment

Priority: Monitor (action score 26/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.5% (FIRST EPSS); higher than 74.1% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. 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 validation of syntactic correctness of input in the FTP gateway (src/clients/FtpGateway.cc), Squid is vulnerable to an out-of-bounds read: when a listing entry date in the TypeA or TypeB directory-listing formats is not followed by a filename, parsing was not restricted to the input buffer, so a trusted client accessing a misbehaving FTP server through Squid's gateway feature could read memory from random unrelated transactions. This issue is fixed in version 7.6.

MediumCVSS 6.5 · v3.1—Proof of concept Fix available
Published
Jul 16, 2026
Updated
Oct 24, 2026
EPSS
1.5% · 74th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.5%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
6.5
NVD has not scored this yet; the score shown is the CNA’s.

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
  • Proof of concept exists, no weaponized module
  • A fix has been released

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

Follow CVE-2026-47729

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

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

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

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 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-2026-33515Mar 25, 2026 · Squid has issues in ICP message handling
    27Monitor
  • ← EarlierCVE-2026-33526Mar 25, 2026 · Squid vulnerable to Denial of Service in ICP Request handling
    39Monitor
  • Later →CVE-2026-50012Jul 16, 2026 · Squid: Memory corruption in cache_digest reply handling
    22Monitor

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

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:52026-06-21

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.

  1. First PoC-26 d
  2. Published
  3. TodayOct 25, 2026+101 d
EPSS, last 120 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.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-33515113 days apartSquid has issues in ICP message handling
    27Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

nvd-secondary

Attack context

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

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

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

All records