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Vulnerability record · CVE-2026-49998 · published 16 July 2026

CVE-2026-49998: Improper verification of cryptographic signature vulnerability

Centrifugo is an open-source scalable real-time messaging server. Prior to 6.8.1, Centrifugo dynamic JWKS endpoint verification could reuse a key for one allowed issuer to verify a JWT for another allowed issuer because the JWKS cache and singleflight lookup were keyed only by JWT header kid, not by the resolved JWKS endpoint, issuer, audience, or trust-domain namespace, affecting client.token.jwks_public_endpoint, client.subscription_token.jwks_public_endpoint, internal/jwks/cache.go, and internal/jwks/manager.go. This issue is fixed in version 6.8.1.

8.2 CVSS 3.1 High EPSS 0.27% · top 83.4% CWE-347 · Improper verification of cryptographic signature Deferred
8.2CVSS 3.1 base score
0.27%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
17 Jul 2026Last modified by NVD

Description

Centrifugo is an open-source scalable real-time messaging server. Prior to 6.8.1, Centrifugo dynamic JWKS endpoint verification could reuse a key for one allowed issuer to verify a JWT for another allowed issuer because the JWKS cache and singleflight lookup were keyed only by JWT header kid, not by the resolved JWKS endpoint, issuer, audience, or trust-domain namespace, affecting client.token.jwks_public_endpoint, client.subscription_token.jwks_public_endpoint, internal/jwks/cache.go, and internal/jwks/manager.go. This issue is fixed in version 6.8.1.

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

References

LinkTags
https://github.com/centrifugal/centrifugo/commit/15d785015c6f318c1b68ea40b813699c9f8bd2c4
https://github.com/centrifugal/centrifugo/pull/1142
https://github.com/centrifugal/centrifugo/releases/tag/v6.8.1
https://github.com/centrifugal/centrifugo/security/advisories/GHSA-g6vg-wj8f-48cj
https://github.com/centrifugal/centrifugo/security/advisories/GHSA-g6vg-wj8f-48cj

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Source: NIST National Vulnerability Database (record CVE-2026-49998), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.