6.9 Medium

Go JOSE provides an implementation of the Javascript Object Signing and Encryption set of standards in Go, including support for JSON Web…

CVE-2026-116585

Summary Decrypting a ciphertext with "A128CBC-HS256", "A192CBC-HS384", or "A256CBC-HS512" can result in a panic on untrusted input. Note this advisory is the same as https://github.com/go-jose/go-jose/security/advisories/GHSA-6mp9-8xrw-74r4. Details Insufficient validation of parameters can lead to attempting to index into an empty buffer. See https://github.com/go-jose/go-jose/pull/292. Workarounds If the application does not require the CBC-HMAC modes for content encryption, and is using github.com/go-jose/go-jose/v4, do not include them in the list of ContentEncryption algorithms passed to ParseEncrypted / ParseEncryptedJSON / ParseEncryptedCompact. Impact Denial of service vulnerability. Any application which decrypts untrusted ciphertexts with the indicated algorithms is affected. Acknowledgements Thanks to Joshua Rogers of AISLE Research for reporting this problem.

Assessment

CVSS: 6.9 (v4.0)
Severity: Medium
EPSS: 0.00264% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 26 October 2026
Last updated: 31 October 2026
Affected: go · github.com/go-jose/go-jose/v4, github.com/go-jose/go-jose/v3
Weakness: CWE-129
Assigner: security-advisories@github.com

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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