CVE-2026-5089

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.40% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 34.4% of scored records. A rank, not a probability.

NVD base score

7.3 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

NVD analysis status

Deferred. NVD last modified this record on 2026-10-26.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-05-12 16:14Z5 MO AGO

Last updated

2026-05-14 13:51Z5 MO AGO

Reserved

2026-03-28

Assigning CNA

CPANSec

Record state

PUBLISHED

Severity

High (CVSS 7.3)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Weaknesses

• CWE-124Buffer Underwrite ('Buffer Underflow')Base
• CWE-125Out-of-bounds ReadBase

Data version

5.2

Document digest

10ffc77fe1bf248eb4e8f8af5fc7952e05cbe77d865694f8535b07f7d04131e0

• metacpan.orghttps://metacpan.org/release/TODDR/YAML-Syck-1.38/changesrelease-notes
• github.comhttps://github.com/cpan-authors/YAML-Syck/issues/132issue-tracking
• github.comhttps://github.com/cpan-authors/YAML-Syck/pull/133issue-tracking
• github.comhttps://github.com/cpan-authors/YAML-Syck/commit/208a4d3bd1b5cdb4a791a6e3905bd6bd45e9d005.patchpatch
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/05/12/16