Improper Handling of Highly Compressed Data (Data Amplification) Affecting jwcrypto package, versions [,1.5.7)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-JWCRYPTO-15928841
- published8 Apr 2026
- disclosed8 Apr 2026
- creditUnknown
Introduced: 8 Apr 2026
CVE-2026-39373 (opens in a new tab)How to fix?
Upgrade jwcrypto to version 1.5.7 or higher.
Overview
Affected versions of this package are vulnerable to Improper Handling of Highly Compressed Data (Data Amplification) through the JWE decompression that has no upper limit for plaintext size. An attacker can exhaust system memory by sending specially crafted compressed tokens that decompress to a much larger size than the input, potentially causing denial of service on memory-constrained systems.
Note:
This issue is due to incomplete fix for CVE-2024-28102.