What’s Vulnerable › Vulnerabilities

CVE-2026-2241: janet-lang janet os.c os_strftime out-of-bounds

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-09 · updated 2026-06-17
• Weakness: CWE-119

Description

A vulnerability was found in janet-lang janet up to 1.40.1. This affects the function os_strftime of the file src/core/os.c. Performing a manipulation results in out-of-bounds read. The attack must be initiated from a local position. The exploit has been made public and could be used. The patch is named 0f285855f0e34f9183956be5f16e045f54626bff. To fix this issue, it is recommended to deploy a patch.

Affected products

• janet-lang janet: through 1.40.1

References

• https://github.com/janet-lang/janet/
• https://github.com/janet-lang/janet/commit/0f285855f0e34f9183956be5f16e045f54626bff
• https://github.com/janet-lang/janet/issues/1701
• https://github.com/janet-lang/janet/issues/1701#event-4446770461
• https://github.com/oneafter/0123/blob/main/ja3/repro
• https://vuldb.com/?ctiid.344980
• https://vuldb.com/?id.344980
• https://vuldb.com/?submit.753156

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