VDB-362555 · Submit #809873 · CVE-2026-8258

Squirrel up to 3.2 sqstdlib/sqstdstring.cpp validate_format stack-based overflow

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.8	$0-$5k	0.00

Summaryinfo

A vulnerability marked as critical has been reported in Squirrel up to 3.2. The affected element is the function validate_format in the library sqstdlib/sqstdstring.cpp. The manipulation leads to stack-based overflow. This vulnerability is referenced as CVE-2026-8258. The attack can only be performed from a local environment. Furthermore, an exploit is available. The project was informed of the problem early through an issue report but has not responded yet.

Detailsinfo

A vulnerability was found in Squirrel up to 3.2. It has been rated as critical. This issue affects the function validate_format in the library sqstdlib/sqstdstring.cpp. The manipulation with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is confidentiality, integrity, and availability.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-8258. The exploitation is known to be easy. Attacking locally is a requirement. Technical details as well as a public exploit are known.

The exploit is available at github.com. It is declared as proof-of-concept. The project was informed of the problem early through an issue report but has not responded yet.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at CNNVD (CNNVD-202605-2395). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

Squirrel

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

05/10/2026 Advisory disclosed
05/10/2026 +0 days VulDB entry created
05/13/2026 +3 days VulDB entry last update

Sourcesinfo

Advisory: 325
Status: Not defined

CVE: CVE-2026-8258 (🔒)
GCVE (CVE): GCVE-0-2026-8258
GCVE (VulDB): GCVE-100-362555
CNNVD: CNNVD-202605-2395 - SQUIRREL 缓冲区错误漏洞

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 05/10/2026 17:05
Updated: 05/13/2026 12:30
Changes: 05/10/2026 17:05 (56), 05/13/2026 12:30 (6)
Complete: 🔍
Submitter: biniam
Cache ID: 216::103

Submitinfo

Accepted

Submit #809873: albertodemichelis squirrel 3.2 Stack-based Buffer Overflow (by biniam)

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.