--- id: CVE-2026-53938 title: >- OpenIDC/cjose is a C library implementing the Javascript Object Signing and Encryption (JOSE) summary: >- 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`) do… severity: high cvss: 8.2 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H' cwe: - CWE-122 - CWE-787 vendor: OpenIDC product: cjose affected: - cjose < 0.6.2.5 published: '2026-09-09' updated: '2026-09-10' sourceUpdated: '2026-09-10T19:57:48.533' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53938' references: - url: >- https://github.com/OpenIDC/cjose/commit/8c51d245273583a658f24ef7b08ba22f848a34a5 label: security-advisories@github.com - url: 'https://github.com/OpenIDC/cjose/security/advisories/GHSA-75r7-f5cv-g3wj' label: security-advisories@github.com - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53938.json - url: 'https://access.redhat.com/security/cve/CVE-2026-53938' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2530240' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-53938' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53938' - url: 'https://access.redhat.com/errata/RHSA-2026:73129' - url: 'https://access.redhat.com/errata/RHSA-2026:79122' - url: 'https://access.redhat.com/errata/RHSA-2026:77369' - url: 'https://access.redhat.com/errata/RHSA-2026:77372' - url: 'https://access.redhat.com/errata/RHSA-2026:77371' - url: 'https://access.redhat.com/errata/RHSA-2026:77370' - url: 'https://access.redhat.com/errata/RHSA-2026:73017' - url: 'https://access.redhat.com/errata/RHSA-2026:73018' - url: 'https://access.redhat.com/errata/RHSA-2026:73128' tags: - nvd - cve.org - csaf - vex - red-hat epss: 0.00236 epssPercentile: 0.14537 ssvc: exploitation: none automatable: 'yes' technicalImpact: partial timestamp: '2026-09-09T15:51:50.383252Z' ingestedAt: '2026-09-09T00:15:28.923Z' patched: - enterprise_linux_appstream_eus_v_10_0 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_8 - enterprise_linux_appstream_aus_v_8_4 - enterprise_linux_appstream_eus_extension_v_8_4 - enterprise_linux_appstream_aus_v_8_6 - enterprise_linux_appstream_eus_extension_v_8_6 - enterprise_linux_appstream_e4s_v_8_8 - enterprise_linux_appstream_tus_v_8_8 - enterprise_linux_appstream_e4s_v_9_2 - enterprise_linux_appstream_e4s_v_9_4 - enterprise_linux_appstream_eus_v_9_6 - enterprise_linux_codeready_linux_builder_eus_v_10_0 - enterprise_linux_codeready_linux_builder_v_10 - codeready_linux_builder_eus_v_9_6 --- ## Overview 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. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 9 · updated 2026-10-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53938.json) - **RHSA-2026:73129** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · released 2026-09-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:73129) - **RHSA-2026:79122** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-10-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:79122) - **RHSA-2026:77369** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-10-07 · [advisory](https://access.redhat.com/errata/RHSA-2026:77369) - **RHSA-2026:77372** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · released 2026-10-07 · [advisory](https://access.redhat.com/errata/RHSA-2026:77372) - **RHSA-2026:77371** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) · released 2026-10-07 · [advisory](https://access.redhat.com/errata/RHSA-2026:77371) - **RHSA-2026:77370** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-10-07 · [advisory](https://access.redhat.com/errata/RHSA-2026:77370) - **RHSA-2026:73017** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-09-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:73017) - **RHSA-2026:73018** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-09-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:73018) - **RHSA-2026:73128** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6) · released 2026-09-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:73128)