Quick answers
- Is CVE-2026-90852 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-90852 being exploited in the wild.
- How severe is CVE-2026-90852?
- High severity, with a CVSS score of 7.3, published 15 September 2026.
- Which products and versions are affected?
- Luben Zstd-Jni up to 1.5.7-13.
- Is there a fix for CVE-2026-90852?
- A patch was published on 2026-09-15: Version 1.5.7-14 released with patch a560131d7834598afd9cea6b7c107bc88e915936 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-90852 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-90852?
- Check whether you run Luben Zstd-Jni at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a use-after-free flaw in the ZstdCompressCtx.loadDict() method of the Dictionary Sharing component in zstd-jni. The issue stems from improper lifetime tracking of dictionary objects when shared across compression contexts, allowing an attacker to reference freed memory. The attack is remotely exploitable without requiring authentication or user interaction. An attacker can trigger the vulnerability to cause denial of service or potentially achieve remote code execution. The vulnerability was patched in version 1.5.7-14 (commit a560131d7834598afd9cea6b7c107bc88e915936), which implements proper cross-object lifetime tracking.
Affected products
- luben zstd-jni up to 1.5.7-13
Timeline
- 2026-09-15: disclosed
- 2026-09-15: patched: Version 1.5.7-14 released with patch a560131d7834598afd9cea6b7c107bc88e915936