PT-2026-39551 · Squirrel · Squirrel

Biniam · Published 2026-05-11 · Updated 2026-05-11 · CVE-2026-8258

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Name of the Vulnerable Software and Affected Versions Squirrel versions prior to 3.3

Description A stack-based buffer overflow occurs in the validate format() function within the sqstdlib/sqstdstring.cpp library. This issue allows a local attacker to execute a manipulation that leads to the overflow.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability. As a temporary workaround, consider restricting the use of the validate format() function.

Exploit

Buffer Overflow

Stack Overflow

Weakness Enumeration

CWE-119

CWE-121

Related Identifiers

CVE-2026-8258

Affected Products

Squirrel

References · 7

• 🔥 https://github.com/biniamf/pocs/tree/main/squirrel-validate_format-memcpy-oob · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-8258 · Security Note
• https://github.com/albertodemichelis/squirrel/issues/325 · Note
• https://vuldb.com/submit/809873 · Note
• https://twitter.com/VulmonFeeds/status/2053677455508898089 · Twitter Post
• https://vuldb.com/vuln/362555/cti · Note
• https://vuldb.com/vuln/362555 · Note