Vulnerability-Lookup

RHSA-2026:92145

Vulnerability from csaf_opensuse - Published: 2026-10-29 15:43 - Updated: 2026-10-29 22:07

Summary

Red Hat Security Advisory: cjose security update

Severity

Critical

Notes

Topic: An update for cjose is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: CJose is C library implementing the Javascript Object Signing and Encryption (JOSE). Security Fix(es): * cjose: OpenIDC/cjose uses all-zero Content Encryption Key for AES-CBC-HMAC JWE encryption (CVE-2026-53939) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-53939

A flaw was found in cjose. When encrypting a JSON Web Encryption (JWE) object using AES-CBC-HMAC algorithms, the library initializes the encryption key with all-zero bytes instead of generating a secure random key. As a result, an attacker who intercepts the encrypted message can decrypt sensitive plaintext and alter or forge content, leading to information disclosure and loss of data integrity.

9.1 (Critical)


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

CWE-331 - Insufficient Entropy

Affected products

Fixed 31 products

Product	Version	Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:cjose-0:0.6.1-17.el9_8.2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:cjose-0:0.6.1-17.el9_8.2.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:cjose-0:0.6.1-17.el9_8.2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:cjose-0:0.6.1-17.el9_8.2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:cjose-0:0.6.1-17.el9_8.2.src	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:cjose-0:0.6.1-17.el9_8.2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:cjose-debuginfo-0:0.6.1-17.el9_8.2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:cjose-debuginfo-0:0.6.1-17.el9_8.2.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:cjose-debuginfo-0:0.6.1-17.el9_8.2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:cjose-debuginfo-0:0.6.1-17.el9_8.2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:cjose-debuginfo-0:0.6.1-17.el9_8.2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:cjose-debugsource-0:0.6.1-17.el9_8.2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:cjose-debugsource-0:0.6.1-17.el9_8.2.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:cjose-debugsource-0:0.6.1-17.el9_8.2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:cjose-debugsource-0:0.6.1-17.el9_8.2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:cjose-debugsource-0:0.6.1-17.el9_8.2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:cjose-debuginfo-0:0.6.1-17.el9_8.2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:cjose-debuginfo-0:0.6.1-17.el9_8.2.i686	—	Vendor Fix fix Workaround
Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:cjose-debuginfo-0:0.6.1-17.el9_8.2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:cjose-debuginfo-0:0.6.1-17.el9_8.2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:cjose-debuginfo-0:0.6.1-17.el9_8.2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:cjose-debugsource-0:0.6.1-17.el9_8.2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:cjose-debugsource-0:0.6.1-17.el9_8.2.i686	—	Vendor Fix fix Workaround
Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:cjose-debugsource-0:0.6.1-17.el9_8.2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:cjose-debugsource-0:0.6.1-17.el9_8.2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:cjose-debugsource-0:0.6.1-17.el9_8.2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:cjose-devel-0:0.6.1-17.el9_8.2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:cjose-devel-0:0.6.1-17.el9_8.2.i686	—	Vendor Fix fix Workaround
Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:cjose-devel-0:0.6.1-17.el9_8.2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:cjose-devel-0:0.6.1-17.el9_8.2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:cjose-devel-0:0.6.1-17.el9_8.2.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Critical

References

11 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:92145	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2530243	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-53939	self
https://bugzilla.redhat.com/show_bug.cgi?id=2530243	external
https://www.cve.org/CVERecord?id=CVE-2026-53939	external
https://nvd.nist.gov/vuln/detail/CVE-2026-53939	external
https://github.com/OpenIDC/cjose/commit/2a6e5bd96…	external
https://github.com/OpenIDC/cjose/releases/tag/v0.6.2.6	external
https://github.com/OpenIDC/cjose/security/advisor…	external

JSON

To clipboard

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          "text": "A flaw was found in cjose. When encrypting a JSON Web Encryption (JWE) object using AES-CBC-HMAC algorithms, the library initializes the encryption key with all-zero bytes instead of generating a secure random key. As a result, an attacker who intercepts the encrypted message can decrypt sensitive plaintext and alter or forge content, leading to information disclosure and loss of data integrity.",
          "title": "Vulnerability description"
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          "category": "summary",
          "text": "cjose: OpenIDC/cjose uses all-zero Content Encryption Key for AES-CBC-HMAC JWE encryption",
          "title": "Vulnerability summary"
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        {
          "category": "other",
          "text": "A CRITICAL severity vulnerability was found in cjose, a C library implementing the Javascript Object Signing and Encryption (JOSE) standards. The cjose package is affected in Red Hat Enterprise Linux 10, Red Hat In-Vehicle OS 2, and Fedora as shipped by Red Hat. When cjose encrypts a JSON Web Encryption (JWE) object using an AES-CBC-HMAC content-encryption algorithm (A128CBC-HS256, A192CBC-HS384, or A256CBC-HS512) together with any key-management algorithm that generates a fresh content-encryption key (CEK), the CEK is initialized to all zero bytes instead of being securely randomly generated. The resulting JWE is therefore encrypted and authenticated under a fixed, publicly known key. An attacker who obtains the encrypted JWE can decrypt it to recover sensitive plaintext and can alter or forge the encrypted content, causing information disclosure and loss of data integrity; availability is not affected. Red Hat and upstream both rate this flaw CRITICAL with a CVSS 3.1 score of 9.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N), so there is no difference from the upstream severity. Fixes for the affected Red Hat product streams are being pursued through delegated resolution.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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        {
          "category": "impact",
          "details": "Critical"
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      "title": "cjose: OpenIDC/cjose uses all-zero Content Encryption Key for AES-CBC-HMAC JWE encryption"
    }
  ]
}

CVE-2026-53939 (GCVE-0-2026-53939)

Vulnerability from cvelistv5 – Published: 2026-09-08 23:36 – Updated: 2026-09-09 15:12

Title

OpenIDC/cjose uses all-zero Content Encryption Key for AES-CBC-HMAC JWE encryption

Summary

OpenIDC/cjose is a C library implementing the Javascript Object Signing and Encryption (JOSE). In versions 0.6.1 through 0.6.2.5, when cjose encrypts a JWE using an AES-CBC-HMAC content-encryption algorithm (`A128CBC-HS256`, `A192CBC-HS384`, or `A256CBC-HS512`) together with any key-management algorithm that generates a fresh content-encryption key (CEK), the CEK is all zero bytes instead of being randomly generated. The resulting JWE is therefore encrypted and authenticated under a fixed, publicly known key, so anyone who obtains the JWE can recover the plaintext and forge or modify the content. This is fixed in version 0.6.2.6 by `_cjose_jwe_set_cek_aes_cbc()` generating the CEK from `RAND_bytes`. A regression test asserts that the `encrypted_key` differs across two encryptions for each AES-CBC-HMAC variant. Until upgrading, for data encrypted with cjose, three options are available. Use an AES-GCM `enc` (`A128GCM` / `A192GCM` / `A256GCM`) instead of an AES-CBC-HMAC `enc`, use `alg=dir` with a caller-supplied CEK, or avoid using cjose for JWE encryption with the affected algorithm pair. These are mitigations for new ciphertexts only; data already encrypted under the zero key remains compromised and should be re-encrypted (and any secrets it contained rotated).

Severity

9.1 (Critical)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-09 15:12 UTC

CWE

CWE-321 - Use of Hard-coded Cryptographic Key
CWE-330 - Use of Insufficiently Random Values

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 8129 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/OpenIDC/cjose/security/advisor…	x_refsource_CONFIRM
https://github.com/OpenIDC/cjose/commit/2a6e5bd96…	x_refsource_MISC
https://github.com/OpenIDC/cjose/releases/tag/v0.6.2.6	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
OpenIDC	cjose	Affected: >= 0.6.1, < 0.6.2.6

Show details on NVD website

JSON

To clipboard

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        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-321",
              "description": "CWE-321: Use of Hard-coded Cryptographic Key",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-330",
              "description": "CWE-330: Use of Insufficiently Random Values",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-08T23:36:13.668Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/OpenIDC/cjose/security/advisories/GHSA-f6wf-pqg3-6wqq",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/OpenIDC/cjose/security/advisories/GHSA-f6wf-pqg3-6wqq"
        },
        {
          "name": "https://github.com/OpenIDC/cjose/commit/2a6e5bd969fa20059fb00913fb9f57d77ea6a4d9",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/OpenIDC/cjose/commit/2a6e5bd969fa20059fb00913fb9f57d77ea6a4d9"
        },
        {
          "name": "https://github.com/OpenIDC/cjose/releases/tag/v0.6.2.6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/OpenIDC/cjose/releases/tag/v0.6.2.6"
        }
      ],
      "source": {
        "advisory": "GHSA-f6wf-pqg3-6wqq",
        "discovery": "UNKNOWN"
      },
      "title": "OpenIDC/cjose uses all-zero Content Encryption Key for AES-CBC-HMAC JWE encryption"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-53939",
    "datePublished": "2026-09-08T23:36:13.668Z",
    "dateReserved": "2026-06-11T15:46:12.318Z",
    "dateUpdated": "2026-09-09T15:12:15.459Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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