Vulnerability-Lookup

RHSA-2026:57200

Vulnerability from csaf_redhat - Published: 2026-08-20 00:45 - Updated: 2026-11-03 19:16

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Important

Notes

Topic: An update for Red Hat Hardened Images RPMs is now available.

Details: This update includes the following RPMs: netavark: * netavark-2.1.0-1.hum1 (aarch64, x86_64) * netavark-tests-2.1.0-1.hum1 (aarch64, x86_64) * netavark-2.1.0-1.hum1.src (src)

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-2026-93599

A flaw was found in rustls-webpki. A remote attacker, by influencing an application to parse a specially crafted Certificate Revocation List (CRL) that contains an empty `onlySomeReasons` value in its `issuingDistributionPoint` extension, could trigger a panic. This vulnerability leads to a denial of service (DoS) in applications that explicitly enable CRL revocation checking.

7.5 (High)


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

CWE-125 - Out-of-bounds Read

Affected products

Fixed 5 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:netavark-2:2.1.0-1.hum1@aarch64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:netavark-2:2.1.0-1.hum1@src	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:netavark-2:2.1.0-1.hum1@x86_64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:netavark-tests-2:2.1.0-1.hum1@aarch64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:netavark-tests-2:2.1.0-1.hum1@x86_64	—	Vendor Fix fix

Threats

Impact Important

References

11 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:57200	self
https://images.redhat.com/	external
https://access.redhat.com/security/cve/CVE-2026-93599	external
https://access.redhat.com/security/updates/classi…	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-93599	self
https://bugzilla.redhat.com/show_bug.cgi?id=2538431	external
https://www.cve.org/CVERecord?id=CVE-2026-93599	external
https://nvd.nist.gov/vuln/detail/CVE-2026-93599	external
https://github.com/rustls/webpki/security/advisor…	external
https://www.vulncheck.com/advisories/rustls-webpk…	external

JSON

To clipboard

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      "cve": "CVE-2026-93599",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "discovery_date": "2026-09-22T18:32:06.471964+00:00",
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          "text": "A flaw was found in rustls-webpki. A remote attacker, by influencing an application to parse a specially crafted Certificate Revocation List (CRL) that contains an empty `onlySomeReasons` value in its `issuingDistributionPoint` extension, could trigger a panic. This vulnerability leads to a denial of service (DoS) in applications that explicitly enable CRL revocation checking.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "rustls-webpki: rustls-webpki: Denial of Service via crafted Certificate Revocation List",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability is rated as Important because an unauthenticated remote attacker can cause an immediate denial of service by triggering an unhandled panic in network-facing services. Exploitation requires the consuming software to explicitly enable Certificate Revocation List (CRL) validation, a capability that is disabled by default in standard rustls configurations. Applications and services that actively ingest revocation lists from untrusted endpoints face service termination, whereas environments utilizing default certificate verification workflows remain unaffected.",
          "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.",
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        {
          "category": "external",
          "summary": "https://github.com/rustls/webpki/security/advisories/GHSA-82j2-j2ch-gfr8",
          "url": "https://github.com/rustls/webpki/security/advisories/GHSA-82j2-j2ch-gfr8"
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          "url": "https://www.vulncheck.com/advisories/rustls-webpki-before-0.103.13-panic-via-empty-bit-string"
        }
      ],
      "release_date": "2026-09-18T13:20:10.258000+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2026-08-20T00:45:29+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
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            "Red Hat Hardened Images:netavark-2:2.1.0-1.hum1@src",
            "Red Hat Hardened Images:netavark-2:2.1.0-1.hum1@x86_64",
            "Red Hat Hardened Images:netavark-tests-2:2.1.0-1.hum1@aarch64",
            "Red Hat Hardened Images:netavark-tests-2:2.1.0-1.hum1@x86_64"
          ],
          "restart_required": {
            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2026:57200"
        }
      ],
      "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": [
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            "Red Hat Hardened Images:netavark-2:2.1.0-1.hum1@src",
            "Red Hat Hardened Images:netavark-2:2.1.0-1.hum1@x86_64",
            "Red Hat Hardened Images:netavark-tests-2:2.1.0-1.hum1@aarch64",
            "Red Hat Hardened Images:netavark-tests-2:2.1.0-1.hum1@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "rustls-webpki: rustls-webpki: Denial of Service via crafted Certificate Revocation List"
    }
  ]
}

CVE-2026-93599 (GCVE-0-2026-93599)

Vulnerability from cvelistv5 – Published: 2026-09-18 13:20 – Updated: 2026-09-18 14:15

Title

rustls-webpki before 0.103.13 Panic via empty BIT STRING

Summary

rustls-webpki through 0.103.12 (and 0.104.0-alpha releases before 0.104.0-alpha.7) contains a reachable panic in bit_string_flags() in src/der.rs. The input guard fails to reject a named-bit BIT STRING whose content is exactly [0x00] (zero padding bits and no data bytes), so raw_bits.len() - 1 underflows on the empty slice and the subsequent index operation panics (subtract-with-overflow in debug, index-out-of-bounds in release). The condition is reachable through the public API BorrowedCertRevocationList::from_der() when a CRL contains an issuingDistributionPoint extension with such an onlySomeReasons value. Exploitation requires an application that explicitly opts in to CRL revocation checking by passing RevocationOptions to verify_for_usage() and that parses CRL bytes obtained from a source the attacker can influence; the default rustls configuration, which does not use RevocationOptions, is unaffected. A crafted CRL causes a denial of service via the panic. Fixed in 0.103.13 and 0.104.0-alpha.7.

Severity

8.7 (High)


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

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-18 14:04 UTC

CWE

CWE-191 - Integer Underflow (Wrap or Wraparound)

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7300 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/rustls/webpki/security/advisor…	vendor-advisory
https://www.vulncheck.com/advisories/rustls-webpk…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
rustls	webpki	Affected: 0 , < 0.103.13 (semver) Affected: 0.104.0-alpha.1 , < 0.104.0-alpha.7 (semver)

Date Public

2026-04-21 00:00

Credits

tynus3

Show details on NVD website

JSON

To clipboard

{
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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-93599",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-18T14:04:54.272751Z",
                "version": "2.0.3"
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          "shortName": "CISA-ADP"
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          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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          "defaultStatus": "unaffected",
          "packageURL": "pkg:cargo/rustls-webpki",
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              "status": "affected",
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              "versionType": "semver"
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        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "tynus3"
        }
      ],
      "datePublic": "2026-04-21T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "rustls-webpki through 0.103.12 (and 0.104.0-alpha releases before 0.104.0-alpha.7) contains a reachable panic in bit_string_flags() in src/der.rs. The input guard fails to reject a named-bit BIT STRING whose content is exactly [0x00] (zero padding bits and no data bytes), so raw_bits.len() - 1 underflows on the empty slice and the subsequent index operation panics (subtract-with-overflow in debug, index-out-of-bounds in release). The condition is reachable through the public API BorrowedCertRevocationList::from_der() when a CRL contains an issuingDistributionPoint extension with such an onlySomeReasons value. Exploitation requires an application that explicitly opts in to CRL revocation checking by passing RevocationOptions to verify_for_usage() and that parses CRL bytes obtained from a source the attacker can influence; the default rustls configuration, which does not use RevocationOptions, is unaffected. A crafted CRL causes a denial of service via the panic. Fixed in 0.103.13 and 0.104.0-alpha.7."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "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"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-191",
              "description": "Integer Underflow (Wrap or Wraparound)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-18T13:20:10.258Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Security Advisory (GHSA-82j2-j2ch-gfr8)",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/rustls/webpki/security/advisories/GHSA-82j2-j2ch-gfr8"
        },
        {
          "name": "VulnCheck Advisory: rustls-webpki before 0.103.13 Panic via empty BIT STRING",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/rustls-webpki-before-0.103.13-panic-via-empty-bit-string"
        }
      ],
      "title": "rustls-webpki before 0.103.13 Panic via empty BIT STRING",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-93599",
    "datePublished": "2026-09-18T13:20:10.258Z",
    "dateReserved": "2026-09-18T11:00:32.755Z",
    "dateUpdated": "2026-09-18T14:15:25.188Z",
    "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

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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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