# CVE-2026-47729: Squid: Memory disclosure in FTP gateway

> A trusted client accessing a misbehaving FTP server via Squid's gateway can read memory from unrelated transactions due to improper input validation.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 16 Jul 2026
- **Updated:** 17 Jul 2026
- **Also known as:** ALPINE-CVE-2026-47729, AZL-92444, DEBIAN-CVE-2026-47729, GHSA-8c37-pxjq-qwrg, MINI-qhpm-mghr-w2gv, UBUNTU-CVE-2026-47729

## What is CVE-2026-47729?

CVE-2026-47729 is a medium-severity vulnerability in Squid-Cache Squid, published on 16 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

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.

Weakness: CWE-1289 (Improper Validation of Unsafe Equivalence in Input), CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-47729?

It affects 1 product.


Products: Squid-Cache Squid.

## How do I fix CVE-2026-47729?

Upgrade to a fixed version.

## Is CVE-2026-47729 being exploited?

There is no known exploitation of CVE-2026-47729 in the wild and no public exploit code.

Public exploit code:

- CVE-2026-47729 (github_poc): https://github.com/0xredash/CVE-2026-47729

## Other vulnerabilities in Squid-Cache Squid

- [CVE-2025-62168](https://insights.sbomify.com/CVE-2025-62168/): Squid vulnerable to information disclosure via authentication credential leakage in error handling (critical 10.0)
- [CVE-2025-54574](https://insights.sbomify.com/CVE-2025-54574/): Squid's URN Handling can lead to Buffer Overflow (critical 9.3)
- [CVE-2026-33526](https://insights.sbomify.com/CVE-2026-33526/): Squid vulnerable to Denial of Service in ICP Request handling (critical 9.2)
- [CVE-2026-32748](https://insights.sbomify.com/CVE-2026-32748/): Squid has Denial of Service in ICP Response handling (high 8.7)
- [CVE-2023-50269](https://insights.sbomify.com/CVE-2023-50269/): SQUID-2023:10 Denial of Service in HTTP Request parsing (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-47729 and fix it if it is affected.

What it is: CVE-2026-47729 is a medium-severity vulnerability in Squid-Cache Squid, published on 16 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-47729 in the wild and no public exploit code.

Affected product: Squid-Cache Squid. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-47729/ (Markdown: https://insights.sbomify.com/CVE-2026-47729/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-47729
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-47729
- OSV: https://osv.dev/vulnerability/CVE-2026-47729

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-47729/
Summaries are generated and may contain mistakes; the official description above is the record.