CVE-2026-2016: happyfish100 libfastcommon base64.c base64_decode stack-based overflow

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-02-06 · updated 2026-06-17
Weakness: CWE-119

Description

A security vulnerability has been detected in happyfish100 libfastcommon up to 1.0.84. Affected by this vulnerability is the function base64_decode of the file src/base64.c. The manipulation leads to stack-based buffer overflow. Local access is required to approach this attack. The exploit has been disclosed publicly and may be used. The identifier of the patch is 82f66af3e252e3e137dba0c3891570f085e79adf. Applying a patch is the recommended action to fix this issue.

Affected products

happyfish100 libfastcommon: through 1.0.84

References

https://github.com/happyfish100/libfastcommon/
https://github.com/happyfish100/libfastcommon/commit/82f66af3e252e3e137dba0c3891570f085e79adf
https://github.com/happyfish100/libfastcommon/issues/55
https://github.com/happyfish100/libfastcommon/issues/55#issue-3836362577
https://github.com/happyfish100/libfastcommon/issues/55#issuecomment-3776757848
https://vuldb.com/?ctiid.344598
https://vuldb.com/?id.344598
https://vuldb.com/?submit.743873

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