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Public proof of concept

CVE-2026-8258

A public proof of concept exists; no exploitation attested.

  • Published2026-05-11
  • WeaknessCWE-119 · CWE-121

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 flaw has been found in Squirrel up to 3.2. Impacted is the function validate_format in the library sqstdlib/sqstdstring.cpp. Executing a manipulation can lead to stack-based buffer overflow. The attack can only be executed locally. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.

Timeline

dates in UTC
  1. 2026-05-1102:16CVE publishedNVD

Versions per branch

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 2026-05-11

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

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

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

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionpoc2026-05-11
  • CNACVSS 4.01.9known since 2026-10-23
  • CNACVSS 3.15.3known since 2026-10-23
  • CNACVSS 2.04.3known since 2026-10-23
  • CNAweakness (CWE)CWE-119, CWE-121known since 2026-10-23
  • FIRST EPSSEPSS score0.1 %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:L/I:L/A:L
CVSS 4.0 vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/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
2026-05-11
Last Modified
2026-07-23
NVD status
Deferred
GitHub Advisory
GHSA-fff5-x34w-4v72

Frequently asked questions

What is CVE-2026-8258?

A flaw has been found in Squirrel up to 3.2. Impacted is the function validate_format in the library sqstdlib/sqstdstring.cpp. Executing a manipulation can lead to stack-based buffer overflow. The attack can only be executed locally. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.

Is CVE-2026-8258 actively exploited?

A proof-of-concept exploit exists for CVE-2026-8258, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-8258?

CVE-2026-8258 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

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