What’s Vulnerable › Vulnerabilities

CVE-2026-2240: janet-lang janet compile.c janetc_pop_funcdef 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 has been found in janet-lang janet up to 1.40.1. The impacted element is the function janetc_pop_funcdef of the file src/core/compile.c. Such manipulation leads to out-of-bounds read. The attack must be carried out locally. The exploit has been disclosed to the public and may be used. The name of the patch is 4dd08a4cdef5b1c42d9a2c19fc24412e97ef51d5. A patch should be applied to remediate this issue.

Affected products

• janet-lang janet: through 1.40.1

References

• https://github.com/janet-lang/janet/
• https://github.com/janet-lang/janet/commit/4dd08a4cdef5b1c42d9a2c19fc24412e97ef51d5
• https://github.com/janet-lang/janet/issues/1702
• https://github.com/janet-lang/janet/issues/1702#issuecomment-3790473369
• https://github.com/oneafter/0123/blob/main/ja4/repro
• https://vuldb.com/?ctiid.344979
• https://vuldb.com/?id.344979
• https://vuldb.com/?submit.753155

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