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CVE-2026-27959

31
FAUCET Score

CVE-2026-27959 is a high-severity Host header injection

Impacted Technologies

VendorProductVersion(s)CPE
< 2.16.4CPE matchmatch criteria
cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*
>= 3.0.0, < 3.1.2CPE matchmatch criteria
cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.33%
Probability of exploitation in next 30 days
EPSS Percentile
25.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0033 is in the 7th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: koaFixed in: 3.1.2
npmpatch availablevia ghsa
Product: koaFixed in: 2.16.4

Vendor Advisories (1)

npmGHSA-7gcc-r8m5-44qmhigh

Koa has Host Header Injection via ctx.hostname

Feb 26, 2026

References

access.redhat.com / errata/RHSA-2026:10184
access.redhat.com / errata/RHSA-2026:7249
access.redhat.com / security/cve/CVE-2026-27959
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-27959.json
github.com / koajs/koa/commit/55ab9bab044ead4e82c70a30a4f9dc0fc9c1b6df
Patch
github.com / koajs/koa/commit/b76ddc01fdb703e51652b0fd131d16394cadcfeb
Patch
github.com / koajs/koa/security/advisories/GHSA-7gcc-r8m5-44qm
ExploitVendor Advisory