Is CVE-2026-5419 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-5419 being exploited in the wild.

How severe is CVE-2026-5419?

Low severity, with a CVSS score of 3.7, published 1 June 2026.

Is there a fix for CVE-2026-5419?

A patch was published on 2026-05-26: Red Hat released security update RHSA-2026:20613 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-5419 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-5419?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-5419: GnuTLS non-constant-time PKCS#7 padding check

CVE-2026-5419 · Severity: low · CVSS 3.7 · Published 2026-06-01

GnuTLS is a widely used security library that helps applications establish secure, encrypted connections. A flaw was found where the library takes different amounts of time to process certain encrypted data, which could allow a remote attacker to slowly piece together sensitive information. While difficult to exploit, this could lead to the unauthorized disclosure of private data.

Quick answers

Is CVE-2026-5419 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-5419 being exploited in the wild.
How severe is CVE-2026-5419?: Low severity, with a CVSS score of 3.7, published 1 June 2026.
Which products and versions are affected?: GnuTLS gnutls 3.8.10-4.el10_2.
Is there a fix for CVE-2026-5419?: A patch was published on 2026-05-26: Red Hat released security update RHSA-2026:20613 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-5419 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-5419?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A timing side-channel vulnerability (CWE-208) exists in GnuTLS due to a non-constant-time PKCS#7 padding check during decryption. By observing minute differences in the time it takes for the library to respond to decryption requests with varying padding, a remote attacker can potentially perform a padding oracle-style attack to recover plaintext information. The attack requires a high degree of complexity and network stability to measure timing differences accurately. Red Hat has released patches for affected GnuTLS packages in RHEL 10.

Affected products

GnuTLS gnutls 3.8.10-4.el10_2

Timeline

2026-05-26: patched: Red Hat released security update RHSA-2026:20613
2026-06-01: disclosed: CVE published in NVD dataset

References

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