Deserialization in Pachno
CVE-2026-40044
Pachno 1.0.6 contains a deserialization vulnerability that allows unauthenticated attackers to execute arbitrary code by injecting malicious serialized objects into cache files. Attackers can write PHP object payloads to world-writable cache files with predictable names in the cache directory, which are unserialized during framework bootstrap before authentication checks occur.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.009 (58.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.009 · change: +0.004
Affected products
- Pachno — versions 1.0.6
- Pancho Pachno — versions 1.0.6
Weakness classification (CWE)
References
- www.zeroscience.mk/en/vulnerabilities/ZSL-2026-5986.php (third-party-advisory)
- www.vulncheck.com/advisories/pachno-filecache-deserialization-remote-code-execu… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-40044?
- CVE-2026-40044 is a critical-severity vulnerability in Pachno, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-04-13.
- How severe is CVE-2026-40044?
- Critical severity. CVSS v3 base score is 9.8 out of 10.