HOMEVULNERABILITIESCVE-2026-9541
MEDIUM

CVE-2026-9541

CWE-119Published: May 26, 2026· Updated: May 27, 2026

5.3
CVSS v3.1

Official Description

A security flaw has been discovered in Squirrel up to 3.2. Impacted is the function ReadObject of the file squirrel/sqobject.cpp of the component Cnut File Handler. Performing a manipulation results in heap-based buffer overflow. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

NVD Source

Technical Analysis

CVE-2026-9541 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityLow
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Affected Vendors & Products

squirrel-lang1 product
squirrel
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/albertodemichelis/squirrel/issues/327
PATCHhttps://github.com/albertodemichelis/squirrel/issues/327
ADVISORYhttps://vuldb.com/submit/814826
ADVISORYhttps://vuldb.com/vuln/365602

All References (6)

→
https://github.com/albertodemichelis/squirrel/issues/327Exploit · Issue Tracking · Mitigation · Patch
→
https://github.com/biniamf/pocs/tree/main/squirrel-sqobject-readobject-neg-len-oobExploit
→
https://vuldb.com/submit/814826Third Party Advisory · VDB Entry · Exploit
→
https://vuldb.com/vuln/365602Third Party Advisory · VDB Entry
→
https://vuldb.com/vuln/365602/ctiPermissions Required · VDB Entry
→
https://github.com/albertodemichelis/squirrel/issues/327Exploit · Issue Tracking · Mitigation · Patch

Quick Facts

CVE IDCVE-2026-9541
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-119
CISA KEVNo
Affected1 vendor
PublishedMay 26, 2026

Related CVEs (CWE-119)

CVE-2026-4254
9.8
CVE-2026-3271
9.8
CVE-2026-39892
9.8
CVE-2026-7854
9.8
CVE-2026-7834
9.8
CVE-2026-7853
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-9541 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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