Improper Authentication Affecting localstack package, versions <4.14.0-r18
Threat Intelligence
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-CHAINGUARDLATEST-LOCALSTACK-17896503
- published9 Jul 2026
- disclosed17 Jul 2026
Introduced: 9 Jul 2026
CVE-2026-49852 (opens in a new tab)How to fix?
Upgrade Chainguard localstack to version 4.14.0-r18 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream localstack package and not the localstack package as distributed by Chainguard.
See How to fix? for Chainguard relevant fixed versions and status.
joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.6.8, joserfc.jwt.decode accepts attacker-forged HMAC-signed tokens when the caller-supplied verification key is the empty string or None, because HMACAlgorithm.sign and HMACAlgorithm.verify in src/joserfc/_rfc7518/jws_algs.py pass the output of OctKey.get_op_key(...) to hmac.new(...) and OctKey.import_key in src/joserfc/_rfc7518/oct_key.py only emits a SecurityWarning for keys shorter than 14 bytes without rejecting zero-length input. This issue is fixed in version 1.6.8.