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Public proof of concept

CVE-2026-3389

A public proof of concept exists; no exploitation attested.

  • Published2026-03-01
  • WeaknessCWE-404 · CWE-476

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A vulnerability was determined in Squirrel up to 3.2. This vulnerability affects the function sqstd_rex_newnode in the library sqstdlib/sqstdrex.cpp. Executing a manipulation can lead to null pointer dereference. The attack can only be executed locally. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.

Timeline

dates in UTC
  1. 2026-03-0110:16CVE publishedNVD

Versions per branch

NVD
Squirrel-lang squirrel
BranchAffectedFixed in
3.2≤ 3.2no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As VulDB, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Squirrel
    Affected
    • = 3.0no fix stated
    • = 3.1no fix stated
    • = 3.2no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-03-01

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • squirrel3Ubuntu:26.10all versions · no fixed version listed
  • squirrel3Ubuntu:26.04:LTSall versions · no fixed version listed
  • squirrel3Ubuntu:25.10all versions · no fixed version listed
  • squirrel3Ubuntu:22.04:LTSall versions · no fixed version listed
  • squirrel3Ubuntu:20.04:LTSall versions · no fixed version listed
  • squirrel3Ubuntu:18.04:LTSall versions · no fixed version listed
  • squirrel3Debian:13all versions · no fixed version listed

Vendor advisories

  • CVE-2026-3389 Red Hat Product Security

    squirrel: Squirrel: Denial of Service via null pointer dereference

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionpoc2026-03-02
  • CNACVSS 4.01.9known since 2026-10-23
  • CNACVSS 3.13.3known since 2026-10-23
  • NVDCVSS 3.15.5read 2026-10-23
  • CNACVSS 2.01.7known since 2026-10-23
  • CNAweakness (CWE)CWE-404, CWE-476known since 2026-10-23
  • FIRST EPSSEPSS score0.2 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-03-01
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-g9mq-qjc2-8pgx

Frequently asked questions

What is CVE-2026-3389?

A vulnerability was determined in Squirrel up to 3.2. This vulnerability affects the function sqstd_rex_newnode in the library sqstdlib/sqstdrex.cpp. Executing a manipulation can lead to null pointer dereference. The attack can only be executed locally. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.

Is CVE-2026-3389 actively exploited?

A proof-of-concept exploit exists for CVE-2026-3389, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-3389?

CVE-2026-3389 has a CVSS v3 base score of 5.5 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

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