CVE-2026-84448

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

0.18% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 8.1% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Deferred. NVD last modified this record on 2026-09-24.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

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

2026-09-18 15:53Z1 MO AGO

Last updated

2026-09-24 20:58Z1 MO AGO

Reserved

2026-09-01

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 4.0)

CNA CVSS vector

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

Weaknesses

• CWE-125Out-of-bounds ReadBase
• CWE-131Incorrect Calculation of Buffer SizeBase

Data version

5.2

Document digest

41096c25f0f9f46983574d86f9edd15348cb579f3b68019bff43723d6d3bc6eb

• github.comhttps://github.com/strukturag/libheif/security/advisories/GHSA-p58j-h3vm-3fp5x_refsource_CONFIRM
• github.comhttps://github.com/strukturag/libheif/commit/646d85fbf5bd18fc3cdc516e915e59072de2d510x_refsource_MISC
• github.comhttps://github.com/strukturag/libheif/releases/tag/v1.23.2x_refsource_MISC