Vulnerability in OpenIDC/cjose (CVE-2026-53938)
Summary
Vulnerability in OpenIDC/cjose (CVE-2026-53938). Risk of unauthorized operations or information disclosure. Exploitable via alg.
Original description
The description as published by the source.
OpenIDC/cjose is a C library implementing the Javascript Object Signing and Encryption (JOSE). Prior to version 0.6.2.5, cjose's JWE decryption path for the AES Key Wrap key-management algorithms (alg = A128KW, A192KW, A256KW) does not validate the length of the attacker-supplied encrypted_key (JWE Encrypted Key) before unwrapping it into a fixed-size, heap-allocated Content Encryption Key (CEK) buffer. A remote, unauthenticated attacker who can submit a crafted JWE to an application that decrypts it with an AES-KW symmetric key can trigger an out-of-bounds heap write, corrupting the heap. This leads at minimum to a crash (denial of service) and, depending on the heap layout and allocator, may be leverageable for further memory-corruption impact. cjose_jwe_import() / cjose_jwe_decrypt() are pre-authentication entry points: they parse and process fully attacker-controlled input. Upgrade to cjose 0.6.2.5 to receive a patch. If upgrading is not immediately possible, reject the AES Key Wrap algorithms (A128KW/A192KW/A256KW) for untrusted JWEs at the application layer.
Source: NIST National Vulnerability Database NVD
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-53938 has been found in OpenIDC/cjose.
Attackers can target a specific entry point like alg over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 8.2/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "OpenIDC/cjose CVE-2026-53938" on the vendor's site.
CVE-2026-53938 (OpenIDC/cjose) — CWE-122 / CVSS v3 8.2
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: alg / A128KW / A192KW / A256KW
Workaround: reject the AES Key Wrap algorithms (A128KW/A192KW/A256KW) for untrusted JWEs at the application layer.
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-122) exists in OpenIDC/cjose. Attackers reach the vulnerable code path via alg without authentication.
Check the vendor advisory for the affected versions of OpenIDC/cjose. Attack surface: alg / A128KW / A192KW / A256KW.
Severity: High (CVSS 8.2/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Workaround: reject the AES Key Wrap algorithms (A128KW/A192KW/A256KW) for untrusted JWEs at the application layer.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'OpenIDC/cjose' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'OpenIDC/cjose' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
OpenIDC/cjoseを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply temporary workaround mitigate
reject the AES Key Wrap algorithms (`A128KW`/`A192KW`/`A256KW`) for untrusted JWEs at the application layer.パッチが適用されるまでの応急処置として、reject the AES Key Wrap algorithms (
A128KW/A192KW/A256KW) for untrusted JWEs at the application layer. を実施。回避策の副作用 (機能低下) を確認した上で。 -
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。