CVE-2026-27959

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

0.33% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 26.2% of scored records. A rank, not a probability.

NVD base score

7.5 (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:N/I:H/A:N

NVD analysis status

Modified. NVD last modified this record on 2026-07-15.

Red Hat severity

Important. 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

2026-02-26 01:45Z6 MO AGO

Last updated

2026-07-15 01:12Z1 MO AGO

Reserved

2026-02-25

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

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

Weaknesses

• CWE-20Improper Input ValidationClass

Data version

5.2

Document digest

0a4f72fc941e800b22324dabeb2620f077f9afb50079b63d77777dc6d748197b

• github.comhttps://github.com/koajs/koa/security/advisories/GHSA-7gcc-r8m5-44qmx_refsource_CONFIRM
• github.comhttps://github.com/koajs/koa/commit/55ab9bab044ead4e82c70a30a4f9dc0fc9c1b6dfx_refsource_MISC
• github.comhttps://github.com/koajs/koa/commit/b76ddc01fdb703e51652b0fd131d16394cadcfebx_refsource_MISC
• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-27959vdb-entryx_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2442928https://bugzilla.redhat.com/show_bug.cgi?id=2442928issue-trackingx_refsource_REDHAT
• security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27959.jsonx_sadp-csaf-vex
• access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:10184vendor-advisoryx_refsource_REDHAT
• access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:7249vendor-advisoryx_refsource_REDHAT