CVE-2026-9541: A security flaw has been discovered in Squirrel up to 3.2

Q: How do I fix CVE-2026-9541?

squirrel: upgrade to newer than 3.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-9541 being exploited?

CVE-2026-9541 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-9541 affect?

CVE-2026-9541 affects squirrel. Severity is medium (CVSS 5.3). 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

Q: How urgent is CVE-2026-9541?

Priority 25/100. Public exploit reference

Routine

MEDIUM 5.3UPGRADE

CVE-2026-9541 is a medium-severity flaw (CVSS 5.3) affecting squirrel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 94%)
CISA exploited list	No
Weakness	CWE-119, CWE-122
Published	2026-05-26
Last modified	2026-07-23

Publisher (CNA): VulDB · Vendor: squirrel-lang

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-26 14:16 UTCPublished CVE record published
2026-07-23 11:10 UTCUpdated Record last modified

squirrel-lang squirrel UPGRADE

Affected: <= 3.2

Fixed in: newer than 3.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy squirrel || rpm -q squirrel || squirrel --version

2. UPGRADE to newer than 3.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade squirrel

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade squirrel

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-9541?

squirrel: upgrade to newer than 3.2. Exact commands for each OS are on this page.

Is CVE-2026-9541 being exploited?

CVE-2026-9541 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-9541 affect?

CVE-2026-9541 affects squirrel. Severity is medium (CVSS 5.3). 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

How urgent is CVE-2026-9541?

Priority 25/100. Public exploit reference

References

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