CVE-2026-34380

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.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• 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

0.25% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 16.9% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Analyzed. 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

2026-04-06 15:22Z6 MO AGO

Last updated

2026-05-12 16:57Z5 MO AGO

Reserved

2026-03-27

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 5.9)

CNA CVSS vector

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

Weaknesses

• CWE-190Integer Overflow or WraparoundBase
• CWE-787Out-of-bounds WriteBase

Data version

5.2

Document digest

fd353e4df7b36e97fe0dce2c8bfe7576a0e62f97cace7cd00364f893329eb205

• github.comhttps://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-q3v8-hw4m-59w5x_refsource_CONFIRM
• github.comhttps://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7x_refsource_MISC
• github.comhttps://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9x_refsource_MISC
• github.comhttps://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9x_refsource_MISC