CVE-2026-77399

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• 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

0.31% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 23.8% 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:L/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-09-23.

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

2026-09-22 18:58Z1 MO AGO

Last updated

2026-09-23 14:36Z1 MO AGO

Reserved

2026-08-20

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 6.5)

CNA CVSS vector

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

Weaknesses

• CWE-400Uncontrolled Resource ConsumptionClass
• CWE-834Excessive IterationClass

Data version

5.2

Document digest

d83fdd63a4bec5c5a047459576ef7dc76aad144ac27f78246b9e60316d32b720

• github.comhttps://github.com/collective/icalendar/security/advisories/GHSA-qjcq-q7h7-r74vx_refsource_CONFIRM
• github.comhttps://github.com/collective/icalendar/pull/1571x_refsource_MISC
• github.comhttps://github.com/collective/icalendar/commit/157f85137c65565a308bbcf4fdcc7d8ebce01267x_refsource_MISC
• github.comhttps://github.com/collective/icalendar/commit/cddd37226adbc52cca52a399f61d38a378221219x_refsource_MISC
• github.comhttps://github.com/collective/icalendar/releases/tag/v7.2.2x_refsource_MISC