Vulnerability-Lookup

RHSA-2026:85848

Vulnerability from csaf_redhat - Published: 2026-10-20 08:52 - Updated: 2026-10-20 11:22

Summary

Red Hat Security Advisory: rust-sequoia-sq security update

Severity

Important

Notes

Topic: An update for rust-sequoia-sq is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Important. 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: Command-line frontends for Sequoia. Security Fix(es): * hickory-resolver: hickory-resolver: DNSSEC validation bypass allows forged DNS records (CVE-2026-93657) * rustls-webpki: rustls-webpki: Denial of Service via crafted Certificate Revocation List (CVE-2026-93599) 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-2026-93599

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 13 products

Product	Version	Remediation
Unresolved product id: AppStream-10.2.Z:rust-sequoia-sq-0:1.4.0.1-4.el10_2.src	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:rust-sequoia-sq-debugsource-0:1.4.0.1-4.el10_2.aarch64	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:rust-sequoia-sq-debugsource-0:1.4.0.1-4.el10_2.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:rust-sequoia-sq-debugsource-0:1.4.0.1-4.el10_2.s390x	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:rust-sequoia-sq-debugsource-0:1.4.0.1-4.el10_2.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:sequoia-sq-0:1.4.0.1-4.el10_2.aarch64	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:sequoia-sq-0:1.4.0.1-4.el10_2.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:sequoia-sq-0:1.4.0.1-4.el10_2.s390x	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:sequoia-sq-0:1.4.0.1-4.el10_2.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:sequoia-sq-debuginfo-0:1.4.0.1-4.el10_2.aarch64	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:sequoia-sq-debuginfo-0:1.4.0.1-4.el10_2.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:sequoia-sq-debuginfo-0:1.4.0.1-4.el10_2.s390x	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:sequoia-sq-debuginfo-0:1.4.0.1-4.el10_2.x86_64	—	Vendor Fix fix

Threats

Impact Important

CVE-2026-93657

A flaw was found in hickory-resolver. This vulnerability allows attackers to bypass Domain Name System Security Extensions (DNSSEC) authentication checks. By controlling the answering zone or being positioned on the network path, an attacker can have forged DNS records accepted as validated, leading to the acceptance of invalid records as successful results.

7.5 (High)


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

CWE-354 - Improper Validation of Integrity Check Value

Affected products

Fixed 13 products, the same list as for CVE-2026-93599

Threats

Impact Important

References

21 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:85848	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2538208	external
https://bugzilla.redhat.com/show_bug.cgi?id=2538431	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
https://access.redhat.com/security/cve/CVE-2026-93657	self
https://bugzilla.redhat.com/show_bug.cgi?id=2538208	external
https://www.cve.org/CVERecord?id=CVE-2026-93657	external
https://nvd.nist.gov/vuln/detail/CVE-2026-93657	external
https://github.com/hickory-dns/hickory-dns	external
https://github.com/hickory-dns/hickory-dns/commit…	external
https://github.com/hickory-dns/hickory-dns/pull/3871	external
https://github.com/hickory-dns/hickory-dns/releas…	external
https://github.com/hickory-dns/hickory-dns/securi…	external
https://www.vulncheck.com/advisories/hickory-reso…	external

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        }
      ],
      "title": "hickory-resolver: hickory-resolver: DNSSEC validation bypass allows forged DNS records"
    }
  ]
}

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 6519 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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CVE-2026-93657 (GCVE-0-2026-93657)

Vulnerability from cvelistv5 – Published: 2026-09-18 14:23 – Updated: 2026-09-21 20:51

Title

hickory-resolver before 0.26.2 DNSSEC Validation Bypass

Summary

hickory-resolver versions before 0.26.2 fail to propagate bogus DNSSEC proof states through the Resolver::lookup() and Resolver::lookup_ip() APIs, allowing invalid records to be returned as successful results. Attackers controlling the answering zone or positioned on the network path can have forged DNS records accepted as validated, bypassing DNSSEC authentication checks.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/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:H/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-21 16:28 UTC

CWE

CWE-347 - Improper Verification of Cryptographic Signature

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6519 records in the last 180 days details

References

6 references

URL	Tags
https://github.com/hickory-dns/hickory-dns/securi…	vendor-advisory
https://github.com/hickory-dns/hickory-dns/commit…	patch
https://github.com/hickory-dns/hickory-dns/pull/3871	patchissue-tracking
https://github.com/hickory-dns/hickory-dns/releas…	release-notes
https://github.com/hickory-dns/hickory-dns	product
https://www.vulncheck.com/advisories/hickory-reso…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
hickory-dns	hickory-resolver	Affected: 0 , < 0.26.2 (semver) Unaffected: 0.26.2 (semver)

Date Public

2026-09-03 21:04

Credits

Ali Firas (thesmartshadow)

Show details on NVD website

JSON

To clipboard

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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.

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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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RHSA-2026:85848

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

CVE-2026-93657 (GCVE-0-2026-93657)

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