TI-2023-26926 Aliases CVE-2023-49290 GHSA-7f9x-gw85-8grf

Malicious parameters can cause a denial of service in lestrrat-go/jwx

MEDIUM 63CWE-400Published 2023-12-04 · Updated 2025-05-29

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · Low
Fix status: Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.

Summary

lestrrat-go/jwx is a Go module implementing various JWx (JWA/JWE/JWK/JWS/JWT, otherwise known as JOSE) technologies. A p2c parameter set too high in JWE's algorithm PBES2-* could lead to a denial of service. The JWE key management algorithms based on PBKDF2 require a JOSE Header Parameter called p2c (PBES2 Count). This parameter dictates the number of PBKDF2 iterations needed to derive a CEK wrapping key. Its primary purpose is to intentionally slow down the key derivation function, making password brute-force and dictionary attacks more resource- intensive. Therefore, if an attacker sets the p2c parameter in JWE to a very large number, it can cause a lot of computational consumption, resulting in a denial of service. This vulnerability has been addressed in commit `64f2a229b` which has been included in release version 1.2.27 and 2.0.18. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00729 54th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Partial jwx (lestrrat-go): 1.2.27, 2.0.18github.com/lestrrat-go/jwx (Go): 1.2.27+1 more productRed Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
lestrrat-go	jwx	before 1.2.27; 2.0.0 to before 2.0.18	1.2.27, 2.0.18	Patch available	CNA
—	github.com/lestrrat-go/jwx (Go)	before 1.2.27	1.2.27	Patch available	GHSA-7f9x-gw85-8grf
—	github.com/lestrrat-go/jwx/v2 (Go)	before 2.0.18	2.0.18	Patch available	GHSA-7f9x-gw85-8grf

jwx Vendorlestrrat-go Affected before 1.2.27; 2.0.0 to before 2.0.18 Fixed in 1.2.27, 2.0.18 Patch available CNA
github.com/lestrrat-go/jwx (Go) Vendor— Affected before 1.2.27 Fixed in 1.2.27 Patch available GHSA-7f9x-gw85-8grf
github.com/lestrrat-go/jwx/v2 (Go) Vendor— Affected before 2.0.18 Fixed in 2.0.18 Patch available GHSA-7f9x-gw85-8grf

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:lestrrat-go:jwx::::::::	before 1.2.27; 2.0.0 to before 2.0.18	Vulnerable	lestrrat-go

cpe:2.3:a:lestrrat-go:jwx:*:*:*:*:*:*:*:* Versions before 1.2.27; 2.0.0 to before 2.0.18 Vulnerable ·lestrrat-go

Remediation

Fix · CNA jwx (lestrrat-go) Fixed in 1.2.27, 2.0.18
Fix · GHSA-7f9x-gw85-8grf github.com/lestrrat-go/jwx (Go) Fixed in 1.2.27 Advisory →
Fix · GHSA-7f9x-gw85-8grf github.com/lestrrat-go/jwx/v2 (Go) Fixed in 2.0.18 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
OpenShift Service Mesh 2	Affected	No fix planned: Will not fix

Not affected: 1 product

Red Hat Openshift Data Foundation 4

Timeline

2026-10-02 Threatist record created from CVE-2023-49290
2026-10-03 Alias added: GHSA-7f9x-gw85-8grf

References

TI-2024-14385 Parsing JSON serialized payload without protected field can lead to segfault CVSS 3.1HIGH 7.5
TI-2024-18702 JWX vulnerable to a denial of service attack using compressed JWE message CVSS 3.1MEDIUM 6.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences