Gnutls: gnutls: denial of service via excessive resource consumption during certificate verification
A flaw was found in GnuTLS. This vulnerability allows a denial of service (DoS) by excessive CPU (Central Processing Unit) and memory consumption via specially crafted malicious certificates containing a large number of name constraints and subject alternative names (SANs).
- BDU:2026-05048
- ALSA-2026:3477
- ALSA-2026:4188
- ALSA-2026:5585
- DLA-4492-1
- DSA-6140-1
- openSUSE-SU-2026:10177-1
- openSUSE-SU-2026:20446-1
- RHSA-2026:30849
- RHSA-2026:30850
- RHSA-2026:33125
- RHSA-2026:3477
- RHSA-2026:4188
- RHSA-2026:5585
- RHSA-2026:6618
- RHSA-2026:6630
- RHSA-2026:6737
- RHSA-2026:6738
- RHSA-2026:7477
- RLSA-2026:3477
- Published
- Feb 9, 2026
- Updated
- Sep 1, 2026
- EPSS
- 0.6% · 49th percentile
- CWE
- CWE-407
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Report tools
Action score
21
Monitor
Low priority for now.
- CVSS
- 21 / 40 · 5.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.6%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · redhat
- 5.3
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.
gitlab.com/gnutls/gnutls gnutls
- 0affected
Red Hat Red Hat AI Inference Server 3.2
- 1780681984 and laternot affected · rpm
- 1775740563 and laternot affected · rpm
Red Hat Red Hat AI Inference Server 3.3
- 1778244559 and laternot affected · rpm
- 1778244531 and laternot affected · rpm
- 1778244546 and laternot affected · rpm
- 1775680192 and laternot affected · rpm
- 1775680262 and laternot affected · rpm
- 1775749857 and laternot affected · rpm
Red Hat Red Hat Ceph Storage 8
- 1774002867 and laternot affected · rpm
Red Hat Red Hat Discovery 2
- 1775668717 and laternot affected · rpm
- 1775675922 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 10
- 0:3.8.10-3.el10_1 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
- 0:3.8.9-9.el10_0.17 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 6
- all versionsaffected
Red Hat Red Hat Enterprise Linux 7
- all versionsaffected
Red Hat Red Hat Enterprise Linux 8
- 0:3.6.16-8.el8_10.5 and laternot affected · rpm
- 0:3.6.16-8.el8_10.5 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
- 0:3.6.14-10.el8_4.1 and laternot affected · rpm
- 0:4.13-3.el8_4.1 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
- 0:3.6.14-10.el8_4.1 and laternot affected · rpm
- 0:4.13-3.el8_4.1 and laternot affected · rpm
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:10 | gnutls | before 3.8.10-3.el10_1 | 3.8.10-3.el10_1 |
| AlmaLinux:10 | gnutls-c++ | before 3.8.10-3.el10_1 | 3.8.10-3.el10_1 |
| AlmaLinux:10 | gnutls-dane | before 3.8.10-3.el10_1 | 3.8.10-3.el10_1 |
| AlmaLinux:10 | gnutls-devel | before 3.8.10-3.el10_1 | 3.8.10-3.el10_1 |
| AlmaLinux:10 | gnutls-fips | before 3.8.10-3.el10_1 | 3.8.10-3.el10_1 |
| AlmaLinux:10 | gnutls-utils | before 3.8.10-3.el10_1 | 3.8.10-3.el10_1 |
| AlmaLinux:8 | gnutls | before 3.6.16-8.el8_10.5 | 3.6.16-8.el8_10.5 |
| AlmaLinux:8 | gnutls-c++ | before 3.6.16-8.el8_10.5 | 3.6.16-8.el8_10.5 |
| AlmaLinux:8 | gnutls-dane | before 3.6.16-8.el8_10.5 | 3.6.16-8.el8_10.5 |
| AlmaLinux:8 | gnutls-devel | before 3.6.16-8.el8_10.5 | 3.6.16-8.el8_10.5 |
| AlmaLinux:8 | gnutls-utils | before 3.6.16-8.el8_10.5 | 3.6.16-8.el8_10.5 |
| AlmaLinux:9 | gnutls | before 3.8.3-10.el9_7 | 3.8.3-10.el9_7 |
| AlmaLinux:9 | gnutls-c++ | before 3.8.3-10.el9_7 | 3.8.3-10.el9_7 |
| AlmaLinux:9 | gnutls-dane | before 3.8.3-10.el9_7 | 3.8.3-10.el9_7 |
| AlmaLinux:9 | gnutls-devel | before 3.8.3-10.el9_7 | 3.8.3-10.el9_7 |
| AlmaLinux:9 | gnutls-utils | before 3.8.3-10.el9_7 | 3.8.3-10.el9_7 |
| Alpine:v3.20 | gnutls | before 3.8.12-r0 | 3.8.12-r0 |
| Debian:11 | gnutls28 | before 3.7.1-5+deb11u9 | 3.7.1-5+deb11u9 |
| Debian:12 | gnutls28 | before 3.7.9-2+deb12u6 | 3.7.9-2+deb12u6 |
| Debian:13 | gnutls28 | before 3.8.9-3+deb13u2 | 3.8.9-3+deb13u2 |
| Debian:14 | gnutls28 | before 3.8.12-1 | 3.8.12-1 |
| openSUSE:Leap 16.0 | gnutls | before 3.8.10-160000.2.1 | 3.8.10-160000.2.1 |
| openSUSE:Tumbleweed | gnutls | before 3.8.12-1.1 | 3.8.12-1.1 |
| Red Hat:enterprise_linux_eus:10.0 | gnutls | before 0:3.8.9-9.el10_0.17 | 0:3.8.9-9.el10_0.17 |
+96
Same product
red hat: all recordsOther highest-scoring records for the same primary product.
- CVE-2025-10230Samba: command injection in wins server hook script52Plan
- CVE-2026-4631Cockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument injection42Plan
- CVE-2026-76578Ipa: freeipa: freeipa: unauthenticated ldap client can obtain administrator credentials via the self-managed-token aci39Monitor
- CVE-2025-4404Freeipa: idm: privilege escalation from host to domain admin in freeipa37Monitor
- CVE-2025-7493Freeipa: idm: privilege escalation from host to domain admin in freeipa36Monitor
- CVE-2025-49796Libxml: type confusion leads to denial of service (dos)36Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| almalinux:gnutls | 3.8.10-3.el10_1 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:gnutls-c++ | 3.8.10-3.el10_1 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:gnutls-dane | 3.8.10-3.el10_1 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:gnutls-devel | 3.8.10-3.el10_1 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:gnutls-fips | 3.8.10-3.el10_1 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:gnutls-utils | 3.8.10-3.el10_1 · AlmaLinux:10 | Package registry (OSV) |
| alpine:gnutls | 3.8.12-r0 · Alpine:v3.20 | Package registry (OSV) |
| debian:gnutls28 | 3.7.9-2+deb12u6 · Debian:12 | Package registry (OSV) |
| opensuse:gnutls | 3.8.3-150600.4.17.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| red hat:gnutls-c++ | 0:3.6.16-5.el8_6.5 · Red Hat:rhel_aus:8.6::appstream | Package registry (OSV) |
| red hat:gnutls-dane | 0:3.6.16-5.el8_6.5 · Red Hat:rhel_aus:8.6::appstream | Package registry (OSV) |
| red hat:gnutls-dane-debuginfo | 0:3.6.16-5.el8_6.5 · Red Hat:rhel_aus:8.6::appstream | Package registry (OSV) |
| red hat:gnutls-debuginfo | 0:3.6.16-5.el8_6.5 · Red Hat:rhel_aus:8.6::appstream | Package registry (OSV) |
| red hat:gnutls-debugsource | 0:3.6.16-5.el8_6.5 · Red Hat:rhel_aus:8.6::appstream | Package registry (OSV) |
| red hat:gnutls-devel | 0:3.6.16-5.el8_6.5 · Red Hat:rhel_aus:8.6::appstream | Package registry (OSV) |
| red hat:gnutls-utils | 0:3.6.16-5.el8_6.5 · Red Hat:rhel_aus:8.6::appstream | Package registry (OSV) |
| red hat:gnutls-utils-debuginfo | 0:3.6.16-5.el8_6.5 · Red Hat:rhel_aus:8.6::appstream | Package registry (OSV) |
| red hat:libtasn1-debuginfo | 0:4.13-3.el8_6.2 · Red Hat:rhel_aus:8.6::appstream | Package registry (OSV) |
| red hat:libtasn1-debugsource | 0:4.13-3.el8_6.2 · Red Hat:rhel_aus:8.6::appstream | Package registry (OSV) |
| red hat:libtasn1-devel | 0:4.13-3.el8_6.2 · Red Hat:rhel_aus:8.6::appstream | Package registry (OSV) |
| red hat:libtasn1-tools | 0:4.13-3.el8_6.2 · Red Hat:rhel_aus:8.6::appstream | Package registry (OSV) |
| rocky linux:gnutls | 0:3.8.10-3.el10_1 · Rocky Linux:10 | Package registry (OSV) |
| suse:gnutls | 3.8.3-150600.4.17.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2026-77680197 days apartLibsoup3: libsoup: quadratic cpu denial of service in http range coalescing after cve-2025-32907 fix21Monitor
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- low · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- Low
Weakness class (CWE)
CWE-407 · Inefficient Algorithmic ComplexityCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- access.redhat.com/errata/RHSA-2026:13812
- access.redhat.com/errata/RHSA-2026:16008
- access.redhat.com/errata/RHSA-2026:16009
- access.redhat.com/errata/RHSA-2026:16174
- access.redhat.com/errata/RHSA-2026:25096
- access.redhat.com/errata/RHSA-2026:30849
- access.redhat.com/errata/RHSA-2026:30850
- access.redhat.com/errata/RHSA-2026:33125
- access.redhat.com/errata/RHSA-2026:3477
- access.redhat.com/errata/RHSA-2026:4188
- access.redhat.com/errata/RHSA-2026:4655
- access.redhat.com/errata/RHSA-2026:4943
- access.redhat.com/errata/RHSA-2026:5585
- access.redhat.com/errata/RHSA-2026:5606
- access.redhat.com/errata/RHSA-2026:6618
- access.redhat.com/errata/RHSA-2026:6630
- access.redhat.com/errata/RHSA-2026:6737
- access.redhat.com/errata/RHSA-2026:6738
- access.redhat.com/errata/RHSA-2026:7329
- access.redhat.com/errata/RHSA-2026:7335
Vendor advisories and official records. Exploit/PoC links are deliberately left out.