What is CVE-2023-26266?

CVE-2023-26266 is a high-severity vulnerability in Afl\+\+ Project, classified under Uncontrolled Search Path Element. CVSS score: 7.3/10. Published 2023-02-21.

How severe is CVE-2023-26266?

High severity. CVSS v3 base score is 7.3 out of 10.

Vulnerability in Afl\+\+ Project

CVE-2023-26266

In AFL++ 4.05c, the CmpLog component uses the current working directory to resolve and execute unprefixed fuzzing targets, allowing code execution.

Published 2023-02-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (32.1th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Afl\+\+ Project — versions 4.05c

Weakness classification (CWE)

CWE-427 — Uncontrolled Search Path Element

References

github.com/AFLplusplus/AFLplusplus/pull/1643 (Exploit, Patch)

Frequently asked questions

What is CVE-2023-26266?: CVE-2023-26266 is a high-severity vulnerability in Afl\+\+ Project, classified under Uncontrolled Search Path Element. CVSS score: 7.3/10. Published 2023-02-21.
How severe is CVE-2023-26266?: High severity. CVSS v3 base score is 7.3 out of 10.