Medium 6.9Published Oct 26, 2026

CVE-2026-116585Go JOSE: Panic during CBC-HMAC processing

Updated under an hour ago (Oct 30, 2026, 5:30 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Go JOSE provides an implementation of the Javascript Object Signing and Encryption set of standards in Go, including support for JSON Web Encryption (JWE), JSON Web Signature (JWS), and JSON Web Token (JWT) standards. Prior to 4.1.5, decrypting untrusted JWE ciphertext with A128CBC-HS256, A192CBC-HS384, or A256CBC-HS512 can pass an empty ciphertext buffer to CBC-HMAC unpadding. Insufficient validation allows the empty buffer to be indexed, causing a panic and denial of service. Applications that decrypt attacker-controlled ciphertext with one of these content-encryption algorithms are affected. This issue is fixed in version 4.1.5.

CVSS: 6.9 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness (CWE): CWE-129
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 26, 2026
First seen by InfoSec Signals: Oct 26, 2026

Affected products

Affected products

go-jose go-jose go_jose:go_jose (from the name)	before 4.1.5	CNA record

References

References

https://github.com/go-jose/go-jose/security/advisories/GHSA-4w3g-jfj2-cw2q	x-refsource-confirm
https://github.com/go-jose/go-jose/pull/292	x-refsource-misc
https://github.com/go-jose/go-jose/commit/35883f7999e87cbd1b1f4cda07fdad8cd71c3dd6	x-refsource-misc
https://github.com/go-jose/go-jose/commit/74114c2fa22669a2b2a296746eaa82e15566fd54	x-refsource-misc
https://github.com/go-jose/go-jose/releases/tag/v4.1.5	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.