How severe is CVE-2022-37434?

CVE-2022-37434 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2022-37434?

Affected package information for CVE-2022-37434 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2022-37434?

No fixed version has been published for CVE-2022-37434 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2022-37434 actively exploited in the wild?

Yes. There are 6 known exploit references for CVE-2022-37434, including 5 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2022-37434?

CVE-2022-37434 has an EPSS (Exploit Prediction Scoring System) score of 92.7%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

What type of vulnerability is CVE-2022-37434?

CVE-2022-37434 is classified as Out-of-bounds Write (CWE-787), CWE-120 (CWE-120). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2022-37434 published, and has it been updated?

CVE-2022-37434 was published on August 5, 2022 and was last updated on April 16, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2022-37434

CRITICAL

Published

Aug 5, 2022

Updated

Apr 16, 2026

Affected

0 pkgs

Patched

None yet

Exploits

6 known

EPSS Exploitation Probability

via FIRST.org ↗

92.7%probability of exploitation in next 30 days

Very High Risk100th percentile+0.20%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

zlib through 1.2.12 has a heap-based buffer over-read or buffer overflow in inflate in inflate.c via a large gzip header extra field. NOTE: only applications that call inflateGetHeader are affected. Some common applications bundle the affected zlib source code but may be unable to call inflateGetHeader (e.g., see the nodejs/node reference).

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.