CVE-2026-89045 (CVSS 4)

Description

zstd-jni versions 1.4.8-4 through 1.5.7-13 fail to validate negative length parameters in ZstdInputStreamNoFinalizer.read(), allowing attackers to trigger infinite loops. Attackers can pass negative length values to cause the read method to spin indefinitely while holding the stream monitor, blocking all other threads from accessing the stream.

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CVSS v3.1 Score

4.0

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS — Exploit Prediction

0.0012

Probability of exploitation

0.03%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-835 CWE-835

References

Other References

https://github.com/luben/zstd-jni https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/java/com/github/luben/zstd/ZstdInputStreamNoFinalizer.java#L133 https://github.com/luben/zstd-jni/commit/dd08685ef913a32e76fb27f43470035c06758646 https://github.com/luben/zstd-jni/releases/tag/v1.5.7-14 https://github.com/luben/zstd-jni/security/advisories/GHSA-9jx2-gfp9-phfm https://www.vulncheck.com/advisories/zstd-jni-1.4.8-4-through-1.5.7-13-denial-of-service-via-negative-length https://github.com/luben/zstd-jni/security/advisories/GHSA-9jx2-gfp9-phfm

Frequently Asked Questions

What is CVE-2026-89045? +

zstd-jni versions 1.4.8-4 through 1.5.7-13 fail to validate negative length parameters in ZstdInputStreamNoFinalizer.read(), allowing attackers to trigger infinite loops. Attackers can pass negative length values to cause the read method to spin indefinitely while holding the stream monitor, blocking all other threads from accessing the stream. It has a CVSS v3.1 base score of 4.0 (MEDIUM).

How severe is CVE-2026-89045? +

CVE-2026-89045 has a CVSS v3.1 score of 4.0 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0012, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-89045? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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