RHSA-2026:50904

Vulnerability from csaf_redhat - Published: 2026-08-05 19:26 - Updated: 2026-08-11 18:50
Summary
Red Hat Security Advisory: RHTAS 1.4 - GA Release of Model Transparency 1.0.3
Severity
Important
Notes
Topic: The GA release of the RHTAS Model Transparency CLI image. For more details please visit the product documentation at https://access.redhat.com/documentation/en-us/red_hat_trusted_artifact_signer/1.4
Details: The RHTAS Model Transparency CLI image can be used to sign and verify AI/ML workloads
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-2026-48526

A flaw was found in PyJWT, a Python library for JSON Web Token (JWT) implementation. When decoding JWTs, the library fails to validate the use of JSON Web Keys (JWK) in the HMAC algorithm while also supporting asymmetric algorithms. This allows a remote attacker to use the issuer's public key as the secret key for the HMAC algorithm, leading to the ability to forge JWTs. This vulnerability can result in authentication bypass or unauthorized access.

7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE-347 - Improper Verification of Cryptographic Signature
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Trusted Artifact Signer 1.4:registry.redhat.io/rhtas/model-transparency-rhel9@sha256:997111359afd34ae4f5e27ac9e883182e0438f7ddcfc4f829d05b79ac5c468ab_amd64 —
Vendor Fix fix
Unresolved product id: Red Hat Trusted Artifact Signer 1.4:registry.redhat.io/rhtas/model-transparency-rhel9@sha256:e0f2fe8d94dbe653218403f633691887fdbd7b651f15c74a3ec909bae2c309e6_arm64 —
Vendor Fix fix
Threats
Impact Important
CVE-2026-59886

A remote attacker can exploit this by providing specially crafted BER/CER/DER-encoded ASN.1 data with a large exponent in the REAL value. When the application subsequently prints, logs, compares, or performs arithmetic on the decoded value, this can cause excessive CPU and memory consumption, leading to a denial of service (DoS).

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Trusted Artifact Signer 1.4:registry.redhat.io/rhtas/model-transparency-rhel9@sha256:997111359afd34ae4f5e27ac9e883182e0438f7ddcfc4f829d05b79ac5c468ab_amd64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Trusted Artifact Signer 1.4:registry.redhat.io/rhtas/model-transparency-rhel9@sha256:e0f2fe8d94dbe653218403f633691887fdbd7b651f15c74a3ec909bae2c309e6_arm64 —
Vendor Fix fix
Workaround
Threats
Impact Important
References
To clipboard 

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            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.4,
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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          "title": "Vulnerability description"
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          "url": "https://github.com/pyasn1/pyasn1/security/advisories/GHSA-hm4w-wwcw-mr6r"
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        {
          "category": "workaround",
          "details": "When processing untrusted ASN.1 data with pyasn1, avoid calling prettyPrint(), str(), float(), int(), or performing comparisons or arithmetic on decoded Real (ASN.1 REAL type) objects. Instead, inspect the raw (mantissa, base, exponent) tuple directly. Where logging decoded ASN.1 structures is necessary, filter out or sanitize Real-typed values before conversion.",
          "product_ids": [
            "Red Hat Trusted Artifact Signer 1.4:registry.redhat.io/rhtas/model-transparency-rhel9@sha256:997111359afd34ae4f5e27ac9e883182e0438f7ddcfc4f829d05b79ac5c468ab_amd64",
            "Red Hat Trusted Artifact Signer 1.4:registry.redhat.io/rhtas/model-transparency-rhel9@sha256:e0f2fe8d94dbe653218403f633691887fdbd7b651f15c74a3ec909bae2c309e6_arm64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Trusted Artifact Signer 1.4:registry.redhat.io/rhtas/model-transparency-rhel9@sha256:997111359afd34ae4f5e27ac9e883182e0438f7ddcfc4f829d05b79ac5c468ab_amd64",
            "Red Hat Trusted Artifact Signer 1.4:registry.redhat.io/rhtas/model-transparency-rhel9@sha256:e0f2fe8d94dbe653218403f633691887fdbd7b651f15c74a3ec909bae2c309e6_arm64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "pyasn1: pyasn1: Denial of Service via crafted ASN.1 REAL values"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Detection rules are retrieved from Rulezet.