GnuTLS PKCS#7 Padding Check timing discrepancy

CVSS Meta Temp Score
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CTI Interest Score
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3.7$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in GnuTLS. Affected by this issue is some unknown functionality of the component PKCS#7 Padding Check. The manipulation results in timing discrepancy. This vulnerability is cataloged as CVE-2026-5419. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in GnuTLS (unknown version). It has been classified as problematic. Affected is an unknown code block of the component PKCS#7 Padding Check. The manipulation with an unknown input leads to a timing discrepancy vulnerability. CWE is classifying the issue as CWE-208. Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not. This is going to have an impact on confidentiality. CVE summarizes:

A flaw was found in gnutls. The PKCS#7 padding check, performed during decryption, was not constant-time. This timing side-channel could allow a remote attacker to potentially leak sensitive information about the padding bytes through observable timing differences. This vulnerability is a form of information disclosure.

The advisory is shared for download at access.redhat.com. This vulnerability is traded as CVE-2026-5419 since 04/02/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

The vulnerability scanner Nessus provides a plugin with the ID 319661 (SUSE SLED15 / SLES15 Security Update : gnutls (SUSE-SU-2026:2115-1)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (319661) and CERT Bund (WID-SEC-2026-1312). Once again VulDB remains the best source for vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • IBM MQ
  • Microsoft Azure Linux
  • Open Source GnuTLS

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.7
CNA Vector (redhat): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Timing discrepancy
CWE: CWE-208 / CWE-203 / CWE-200
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 319661
Nessus Name: SUSE SLED15 / SLES15 Security Update : gnutls (SUSE-SU-2026:2115-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

04/02/2026 CVE reserved
06/02/2026 +61 days Advisory disclosed
06/02/2026 +0 days VulDB entry created
06/20/2026 +17 days VulDB entry last update

Sourcesinfo

Advisory: RHSA-2026:20613
Status: Not defined

CVE: CVE-2026-5419 (🔒)
GCVE (CVE): GCVE-0-2026-5419
GCVE (VulDB): GCVE-100-367764
CERT Bund: WID-SEC-2026-1312 - GnuTLS: Mehrere Schwachstellen

Entryinfo

Created: 06/02/2026 07:51
Updated: 06/20/2026 01:56
Changes: 06/02/2026 07:51 (62), 06/04/2026 03:07 (7), 06/09/2026 04:46 (2), 06/20/2026 01:56 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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