CVE-2026-53583

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

0.23% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 14.7% of scored records. A rank, not a probability.

NVD base score

6.5 (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:N

NVD analysis status

Awaiting Analysis. 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

2026-08-20 18:39Z2 MO AGO

Last updated

2026-08-20 19:04Z2 MO AGO

Reserved

2026-06-09

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 6.5)

CNA CVSS vector

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

Weaknesses

• CWE-295Improper Certificate ValidationBase
• CWE-297Improper Validation of Certificate with Host MismatchVariant

Data version

5.2

Document digest

a4fe636d7f3abb66ccacb889be223b02557822490f57e7624ab83a2848b19f07

• github.comhttps://github.com/libgit2/libgit2/security/advisories/GHSA-h7gc-w2gg-p9xpx_refsource_CONFIRM
• github.comhttps://github.com/libgit2/libgit2/commit/647dcb432980b84ede4cb5a008bbd1ccb4ead03dx_refsource_MISC
• github.comhttps://github.com/libgit2/libgit2/commit/c2aa35409ee0e6515df64da49750f13a0a42c47fx_refsource_MISC
• github.comhttps://github.com/libgit2/libgit2/commit/ef086bc3e4eedf62be38a910381aae24d49871ffx_refsource_MISC
• github.comhttps://github.com/libgit2/libgit2/releases/tag/v1.8.6x_refsource_MISC
• github.comhttps://github.com/libgit2/libgit2/releases/tag/v1.9.5x_refsource_MISC