Out-of-bounds Write Affecting fulcio package, versions <0:1.9.0-0.1.hum1


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.34% (25th percentile)

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  • Snyk IDSNYK-RHEL10-FULCIO-21274008
  • published20 Oct 2026
  • disclosed7 Oct 2026

Introduced: 7 Oct 2026

NewCVE-2026-56851  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade RHEL:10 fulcio to version 0:1.9.0-0.1.hum1 or higher.
This issue was patched in RHSA-2026:76606.

NVD Description

Note: Versions mentioned in the description apply only to the upstream fulcio package and not the fulcio package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

The Nickname profile can panic with an out-of-bounds slice error when transforming crafted input into a short destination buffer.

CVSS Base Scores

version 3.1