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CVE-2026-42015· NVD / CVE Program· CNA redhat

Gnutls: gnutls: memory corruption due to off-by-one error in pkcs#12 bag handling

Noroxi assessment

Priority: Monitor (action score 21/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.92% (FIRST EPSS); higher than 59.6% of all records.
  • 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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: azl3 gnutls 3.8.3-11 on Azure Linux 3.0 3.8.13-1.

Low priority for now. Upgrade to azl3 gnutls 3.8.3-11 on Azure Linux 3.0 3.8.13-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A flaw was found in gnutls. An off-by-one error exists in the PKCS#12 bag element bounds check. This vulnerability allows an remote attacker to write past the internal array of a PKCS#12 bag when appending to a bag that already contains 32 elements. This memory corruption could lead to a denial of service (DoS) or potentially other unspecified impacts.

MediumCVSS 5.3 · v3.1—No exploit Fix available
Published
May 26, 2026
Updated
Oct 14, 2026
EPSS
0.9% · 59th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.9%

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.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

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 Cert Manager support for Red Hat OpenShift release 1.17

    • 1791371080 and laternot affected · rpm
    • 1791371069 and laternot affected · rpm
    • 1791788287 and laternot affected · rpm
    • 1791970484 and laternot affected · rpm

  • Red Hat Cert Manager support for Red Hat OpenShift release 1.18

    • 1791459707 and laternot affected · rpm
    • 1791459711 and laternot affected · rpm
    • 1791459759 and laternot affected · rpm
    • 1789029076 and laternot affected · rpm
    • 1791966259 and laternot affected · rpm

  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20

    • 1790598593 and laternot affected · rpm

  • Red Hat Red Hat Discovery 2

    • 1782159791 and laternot affected · rpm
    • 1782166952 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 10

    • 0:3.8.10-4.el10_2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support

    • 0:3.8.9-9.el10_0.19 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support

    • 0:3.3.29-9.el7_9.2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8

    • 0:3.6.16-8.el8_10.6 and laternot affected · rpm
    • 0:3.6.16-8.el8_10.6 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.

EcosystemPackageAffected rangeFix
Alpine:v3.20gnutlsbefore 3.8.13-r03.8.13-r0
Debian:12gnutls28before 3.7.9-2+deb12u73.7.9-2+deb12u7
Debian:13gnutls28before 3.8.9-3+deb13u43.8.9-3+deb13u4
Debian:14gnutls28before 3.8.13-13.8.13-1
openSUSE:Tumbleweedgnutlsbefore 3.8.13-1.13.8.13-1.1
Red Hat:enterprise_linux_eus:10.0gnutlsbefore 0:3.8.9-9.el10_0.190:3.8.9-9.el10_0.19
Red Hat:enterprise_linux_eus:10.0gnutls-c++before 0:3.8.9-9.el10_0.190:3.8.9-9.el10_0.19
Red Hat:enterprise_linux_eus:10.0gnutls-c++-debuginfobefore 0:3.8.9-9.el10_0.190:3.8.9-9.el10_0.19
Red Hat:enterprise_linux_eus:10.0gnutls-danebefore 0:3.8.9-9.el10_0.190:3.8.9-9.el10_0.19
Red Hat:enterprise_linux_eus:10.0gnutls-dane-debuginfobefore 0:3.8.9-9.el10_0.190:3.8.9-9.el10_0.19
Red Hat:enterprise_linux_eus:10.0gnutls-debuginfobefore 0:3.8.9-9.el10_0.190:3.8.9-9.el10_0.19
Red Hat:enterprise_linux_eus:10.0gnutls-debugsourcebefore 0:3.8.9-9.el10_0.190:3.8.9-9.el10_0.19
Red Hat:enterprise_linux_eus:10.0gnutls-develbefore 0:3.8.9-9.el10_0.190:3.8.9-9.el10_0.19
Red Hat:enterprise_linux_eus:10.0gnutls-fipsbefore 0:3.8.9-9.el10_0.190:3.8.9-9.el10_0.19
Red Hat:enterprise_linux_eus:10.0gnutls-utilsbefore 0:3.8.9-9.el10_0.190:3.8.9-9.el10_0.19
Red Hat:enterprise_linux_eus:10.0gnutls-utils-debuginfobefore 0:3.8.9-9.el10_0.190:3.8.9-9.el10_0.19
Red Hat:enterprise_linux:10.2gnutlsbefore 0:3.8.10-4.el10_20:3.8.10-4.el10_2
Red Hat:enterprise_linux:10.2gnutls-c++before 0:3.8.10-4.el10_20:3.8.10-4.el10_2
Red Hat:enterprise_linux:10.2gnutls-c++-debuginfobefore 0:3.8.10-4.el10_20:3.8.10-4.el10_2
Red Hat:enterprise_linux:10.2gnutls-danebefore 0:3.8.10-4.el10_20:3.8.10-4.el10_2
Red Hat:enterprise_linux:10.2gnutls-dane-debuginfobefore 0:3.8.10-4.el10_20:3.8.10-4.el10_2
Red Hat:enterprise_linux:10.2gnutls-debuginfobefore 0:3.8.10-4.el10_20:3.8.10-4.el10_2
Red Hat:enterprise_linux:10.2gnutls-debugsourcebefore 0:3.8.10-4.el10_20:3.8.10-4.el10_2
Red Hat:enterprise_linux:10.2gnutls-develbefore 0:3.8.10-4.el10_20:3.8.10-4.el10_2

+96

Same product

red hat: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-10230Samba: command injection in wins server hook script
    52Plan
  • CVE-2026-4631Cockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument injection
    42Plan
  • CVE-2026-76578Ipa: freeipa: freeipa: unauthenticated ldap client can obtain administrator credentials via the self-managed-token aci
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-42012May 26, 2026 · Gnutls: gnutls: certificate validation bypass due to improper handling of uri and srv sans
    28Monitor
  • ← EarlierCVE-2026-42013May 26, 2026 · Gnutls: gnutls: certificate validation bypass due to oversized subject alternative name
    32Monitor
  • Later →CVE-2026-5260May 26, 2026 · Gnutls: gnutls: information disclosure via heap overread in rsa key exchange
    32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
azl3 gnutls 3.8.3-11 on Azure Linux 3.03.8.13-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
alpine:gnutls3.8.13-r0 · Alpine:v3.20Package registry (OSV)
debian:gnutls283.7.9-2+deb12u7 · Debian:12Package registry (OSV)
opensuse:gnutls3.8.13-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:gnutls0:3.8.13-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:gnutls-c++0:3.6.16-8.el8_10.6 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:gnutls-c++0:3.8.13-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:gnutls-c++-debuginfo0:3.6.16-8.el8_10.6 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:gnutls-dane0:3.6.16-8.el8_10.6 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:gnutls-dane0:3.8.13-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:gnutls-dane-debuginfo0:3.6.16-8.el8_10.6 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:gnutls-debuginfo0:3.6.16-8.el8_10.6 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:gnutls-debugsource0:3.6.16-8.el8_10.6 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:gnutls-devel0:3.6.16-8.el8_10.6 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:gnutls-devel0:3.8.13-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:gnutls-fips0:3.8.10-4.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:gnutls-fips0:3.8.13-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:gnutls-utils0:3.6.16-8.el8_10.6 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:gnutls-utils0:3.8.13-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:gnutls-utils-debuginfo0:3.6.16-8.el8_10.6 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:mingw32-gnutls0:3.8.13-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:mingw64-gnutls0:3.8.13-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
rocky linux:gnutls0:3.6.16-8.el8_10.6 · Rocky Linux:8Package registry (OSV)
suse:gnutls3.7.3-150400.24.2 · SUSE:Linux Enterprise Micro 5.3Package 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.

EPSS, last 120 days

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 researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-104033133 days apartSssd: sssd: access control bypass via improper ldap shadow expiration check
    21Monitor

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-193 · Off-by-one Error

CVSS 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

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (19 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records