Gnutls: gnutls: security bypass allows acceptance of revoked server certificates via crafted ocsp response
Priority MEDIUM 51CWE-179Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Partial Red Hat: 12 fixed, 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted Online Certificate Status Protocol (OCSP) response during a TLS handshake. Due to a logic error in how gnutls processes multi-record OCSP responses, a client with OCSP verification enabled may incorrectly accept a revoked server certificate, potentially leading to a compromise of trust.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00804 56th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial gnutls: 3.8.13Red Hat: 15 advisoriesRed Hat: 12 fixed, 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | gnutls | before 3.8.13 | 3.8.13 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 10 | — | 3.8.10-4.el10_2 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — | 3.8.9-9.el10_0.19 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | 3.8.10-4.el9_8 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | 3.8.10-4.el9_8 | Patch available | CNA |
| Red Hat | Cert Manager support for Red Hat OpenShift release 1.17 | — | 1791371080 | Patch available | CNA |
| Red Hat | Cert Manager support for Red Hat OpenShift release 1.17 | — | 1791371069 | Patch available | CNA |
| Red Hat | Cert Manager support for Red Hat OpenShift release 1.17 | — | 1791788287 | Patch available | CNA |
| Red Hat | Cert Manager support for Red Hat OpenShift release 1.17 | — | 1791970484 | Patch available | CNA |
| Red Hat | Cert Manager support for Red Hat OpenShift release 1.18 | — | 1791459707 | Patch available | CNA |
| Red Hat | Cert Manager support for Red Hat OpenShift release 1.18 | — | 1791459711 | Patch available | CNA |
| Red Hat | Cert Manager support for Red Hat OpenShift release 1.18 | — | 1791459759 | Patch available | CNA |
| Red Hat | Cert Manager support for Red Hat OpenShift release 1.18 | — | 1789029076 | Patch available | CNA |
| Red Hat | Cert Manager support for Red Hat OpenShift release 1.18 | — | 1791966259 | Patch available | CNA |
| Red Hat | Cert Manager support for Red Hat OpenShift release 1.20 | — | 1790598593 | Patch available | CNA |
| Red Hat | Red Hat Discovery 2 | — | 1782159791 | Patch available | CNA |
| Red Hat | Red Hat Discovery 2 | — | 1782166952 | Patch available | CNA |
| Red Hat | Red Hat Hardened Images | — | 3.8.13-1.hum1 | Patch available | CNA |
| Red Hat | Red Hat Update Infrastructure 5 | — | 1781525684 | Patch available | CNA |
| Red Hat | Red Hat Update Infrastructure 5 | — | 1781525671 | Patch available | CNA |
| Red Hat | Red Hat Update Infrastructure 5 | — | 1781525693 | Patch available | CNA |
| Red Hat | Red Hat Update Infrastructure 5 | — | 1781525739 | Patch available | CNA |
| Red Hat | Red Hat Update Infrastructure 5 | — | 1787241211 | Patch available | CNA |
| Red Hat | Red Hat Update Infrastructure 5 | — | 1787135742 | Patch available | CNA |
| Red Hat | Red Hat Update Infrastructure 5 | — | 1787241260 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 6 | — | — | Not affected | CNA |
| Red Hat | Red Hat Enterprise Linux 7 | — | — | Not affected | CNA |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | No fix listed | CNA |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — | No fix listed | CNA |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — | No fix listed | CNA |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — | No fix listed | CNA |
- gnutls Vendor— Affected before 3.8.13 Fixed in 3.8.13 Patch available CNA
- Red Hat Enterprise Linux 10 VendorRed Hat Affected — Fixed in 3.8.10-4.el10_2 Patch available CNA
- Red Hat Enterprise Linux 10.0 Extended Update Support VendorRed Hat Affected — Fixed in 3.8.9-9.el10_0.19 Patch available CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 3.8.10-4.el9_8 Patch available CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 3.8.10-4.el9_8 Patch available CNA
- Cert Manager support for Red Hat OpenShift release 1.17 VendorRed Hat Affected — Fixed in 1791371080 Patch available CNA
- Cert Manager support for Red Hat OpenShift release 1.17 VendorRed Hat Affected — Fixed in 1791371069 Patch available CNA
- Cert Manager support for Red Hat OpenShift release 1.17 VendorRed Hat Affected — Fixed in 1791788287 Patch available CNA
- Cert Manager support for Red Hat OpenShift release 1.17 VendorRed Hat Affected — Fixed in 1791970484 Patch available CNA
- Cert Manager support for Red Hat OpenShift release 1.18 VendorRed Hat Affected — Fixed in 1791459707 Patch available CNA
- Cert Manager support for Red Hat OpenShift release 1.18 VendorRed Hat Affected — Fixed in 1791459711 Patch available CNA
- Cert Manager support for Red Hat OpenShift release 1.18 VendorRed Hat Affected — Fixed in 1791459759 Patch available CNA
- Cert Manager support for Red Hat OpenShift release 1.18 VendorRed Hat Affected — Fixed in 1789029076 Patch available CNA
- Cert Manager support for Red Hat OpenShift release 1.18 VendorRed Hat Affected — Fixed in 1791966259 Patch available CNA
- Cert Manager support for Red Hat OpenShift release 1.20 VendorRed Hat Affected — Fixed in 1790598593 Patch available CNA
- Red Hat Discovery 2 VendorRed Hat Affected — Fixed in 1782159791 Patch available CNA
- Red Hat Discovery 2 VendorRed Hat Affected — Fixed in 1782166952 Patch available CNA
- Red Hat Hardened Images VendorRed Hat Affected — Fixed in 3.8.13-1.hum1 Patch available CNA
- Red Hat Update Infrastructure 5 VendorRed Hat Affected — Fixed in 1781525684 Patch available CNA
- Red Hat Update Infrastructure 5 VendorRed Hat Affected — Fixed in 1781525671 Patch available CNA
- Red Hat Update Infrastructure 5 VendorRed Hat Affected — Fixed in 1781525693 Patch available CNA
- Red Hat Update Infrastructure 5 VendorRed Hat Affected — Fixed in 1781525739 Patch available CNA
- Red Hat Update Infrastructure 5 VendorRed Hat Affected — Fixed in 1787241211 Patch available CNA
- Red Hat Update Infrastructure 5 VendorRed Hat Affected — Fixed in 1787135742 Patch available CNA
- Red Hat Update Infrastructure 5 VendorRed Hat Affected — Fixed in 1787241260 Patch available CNA
- Red Hat Enterprise Linux 6 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat OpenShift Container Platform 4 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat OpenShift Container Platform 4 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat OpenShift Container Platform 4 VendorRed Hat Affected — Fixed in — No fix listed CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:gnu:gnutls:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | GNU |
| cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Red Hat |
| cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:* | 4.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* | 6.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* | 8.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Red Hat |
- cpe:2.3:a:gnu:gnutls:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·GNU
- cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Red Hat
- cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:* Versions 4.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Red Hat
Remediation
- Fix · CNA gnutls Fixed in 3.8.13
Red Hat 15 advisories
- RHSA-2026:82888 Released 2026-10-14 · Red Hat rating Importantcert-manager Operator for Red Hat OpenShift 1.17.2
- Cert Manager support for Red Hat OpenShift release 1.17 registry.redhat.io/cert-manager/cert-manager-operator-bundle
- RHSA-2026:82857 Released 2026-10-14 · Red Hat rating Importantcert-manager Operator for Red Hat OpenShift 1.18.2
- Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/cert-manager-operator-bundle
- RHSA-2026:82372 Released 2026-10-13 · Red Hat rating Importantcert-manager Operator for Red Hat OpenShift 1.18.2
- Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/cert-manager-operator-rhel9
Show 12 more Red Hat advisories
- RHSA-2026:82354 Released 2026-10-13 · Red Hat rating Importantcert-manager Operator for Red Hat OpenShift 1.18.2
- Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/cert-manager-istio-csr-rhel9
- RHSA-2026:82347 Released 2026-10-13 · Red Hat rating Importantcert-manager Operator for Red Hat OpenShift 1.18.2
- Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/jetstack-cert-manager-acmesolver-rhel9, registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9
- RHSA-2026:82322 Released 2026-10-13 · Red Hat rating Importantcert-manager Operator for Red Hat OpenShift 1.17.2
- Cert Manager support for Red Hat OpenShift release 1.17 registry.redhat.io/cert-manager/cert-manager-operator-rhel9
- RHSA-2026:82304 Released 2026-10-13 · Red Hat rating Importantcert-manager Operator for Red Hat OpenShift 1.17.2
- Cert Manager support for Red Hat OpenShift release 1.17 registry.redhat.io/cert-manager/jetstack-cert-manager-acmesolver-rhel9, registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9
- RHSA-2026:72502 Released 2026-09-28 · Red Hat rating Importantcert-manager Operator for Red Hat OpenShift 1.20.1
- Cert Manager support for Red Hat OpenShift release 1.20 registry.redhat.io/cert-manager/cert-manager-trust-manager-rhel9
- RHSA-2026:58981 Released 2026-08-24 · Red Hat rating CriticalRed Hat Update Infrastructure 5.3 Technology Preview security update
- Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-kubernetes-tp-rhel9, registry.redhat.io/rhui5/installer-tp-rhel9, registry.redhat.io/rhui5/rhua-tp-rhel9
- RHSA-2026:29197 Released 2026-06-24 · Red Hat rating ImportantA Subscription Management tool for finding and reporting Red Hat product usage
- Red Hat Discovery 2 registry.redhat.io/discovery/discovery-server-rhel9, registry.redhat.io/discovery/discovery-ui-rhel9
- RHSA-2026:26409 Released 2026-06-16 · Red Hat rating Importantgnutls security update
- Red Hat Enterprise Linux AppStream EUS (v. 10.0) gnutls-c++-3.8.9-9.el10_0.19, gnutls-dane-3.8.9-9.el10_0.19, gnutls-devel-3.8.9-9.el10_0.19 +2
- Red Hat Enterprise Linux BaseOS EUS (v. 10.0) gnutls-3.8.9-9.el10_0.19
- RHSA-2026:26319 Released 2026-06-16 · Red Hat rating ImportantRed Hat Update Infrastructure 5.2 security update
- Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9, registry.redhat.io/rhui5/installer-rhel9 +1
- RHSA-2026:20612 Released 2026-05-26 · Red Hat rating Importantgnutls security update
- Red Hat Enterprise Linux AppStream (v. 9) gnutls-c++-3.8.10-4.el9_8, gnutls-dane-3.8.10-4.el9_8, gnutls-devel-3.8.10-4.el9_8 +1
- Red Hat Enterprise Linux BaseOS (v. 9) gnutls-3.8.10-4.el9_8
- RHSA-2026:20613 Released 2026-05-26 · Red Hat rating Importantgnutls security update
- Red Hat Enterprise Linux AppStream (v. 10) gnutls-c++-3.8.10-4.el10_2, gnutls-dane-3.8.10-4.el10_2, gnutls-devel-3.8.10-4.el10_2 +2
- Red Hat Enterprise Linux BaseOS (v. 10) gnutls-3.8.10-4.el10_2
- RHSA-2026:13274 Released 2026-05-02 · Red Hat rating ImportantRed Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images gnutls-3.8.13-1.hum1@aarch64, gnutls-3.8.13-1.hum1@src, gnutls-3.8.13-1.hum1@x86_64 +14
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Cert Manager support for Red Hat OpenShift release 1.17 | Fixed | RHSA-2026:82304, RHSA-2026:82322, RHSA-2026:82888 |
| Cert Manager support for Red Hat OpenShift release 1.18 | Fixed | RHSA-2026:82347, RHSA-2026:82354, RHSA-2026:82372, RHSA-2026:82857 |
| Cert Manager support for Red Hat OpenShift release 1.20 | Fixed | RHSA-2026:72502 |
| Red Hat Discovery 2 | Fixed | RHSA-2026:29197 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:20613 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:20612 |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Fixed | RHSA-2026:26409 |
| Red Hat Enterprise Linux BaseOS (v. 10) | Fixed | RHSA-2026:20613 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2026:20612 |
| Red Hat Enterprise Linux BaseOS EUS (v. 10.0) | Fixed | RHSA-2026:26409 |
| Red Hat Hardened Images | Fixed | RHSA-2026:13274 |
| Red Hat Update Infrastructure 5 | Fixed | RHSA-2026:26319, RHSA-2026:58981 |
Not affected: 5 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux AppStream EUS (v. 10.0)
- Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
- Red Hat Update Infrastructure 5
Timeline
- 2026-10-02 Threatist record created from CVE-2026-3832
- 2026-10-03 Alias added: GHSA-3rqj-4qqw-jgwr
- 2026-10-14 Fix available: RHSA-2026:82304 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82322 · Red Hat
- 2026-10-14 Fix available: cert-manager/cert-manager-istio-csr-rhel9@1791459759, cert-manager/cert-manager-operator-rhel9@1789029076, cert-manager/cert-manager-operator-rhel9@1791788287 +4 · CNA
- 2026-10-14 5 new references · CNA
- 2026-10-14 Fix available: RHSA-2026:82372 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82354 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82347 · Red Hat
- 2026-10-15 Fix available: RHSA-2026:82857 · Red Hat
- 2026-10-15 Fix available: RHSA-2026:82888 · Red Hat
- 2026-10-15 Fix available: cert-manager/cert-manager-operator-bundle@1791966259, cert-manager/cert-manager-operator-bundle@1791970484 · CNA
- 2026-10-15 2 new references · CNA
- 2026-10-16 Fix available: Cert Manager support for Red Hat OpenShift release 1.17, Cert Manager support for Red Hat OpenShift release 1.18 · Red Hat
References
Advisory 17
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Sources
- CVE-2026-3832 · CVE Program
- CVE-2026-3832 · NVD
- FIRST EPSS
- GHSA-3rqj-4qqw-jgwr · GitHub Advisory Database · CC BY 4.0
- CVE-2026-3832 · Red Hat security data · CC BY 4.0
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