CVE-2026-77775: Headroom Labs Headroom

Headroom Proxy Sends Upstream Requests to a Client-Supplied Base URL Without Address Validation

CVSS 7.7 HighEPSS 0.0059 · 48th percentile

Published by the CVE Program (CNA: VulnCheck) at 21 Aug 2026, 11:22 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Headroom Labs	Headroom Package name: headroom-ai https://pypi.org pkg:pypi/headroom-ai	affected before 0.36.1 semver unaffected 0.36.1 semver Other versions: unaffected

Identifiers

CVE-2026-77775

CNA

VulnCheck

Weakness (CWE)

CWE-918

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.6	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N	CNA (VulnCheck)
7.7	High	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N	CNA (VulnCheck)Used for this record

CISA KEV Not listed.
EPSS 0.0059, the 48th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

21 Aug 2026, 11:22 UTC Confirmed by the CVE List

Sources

References from the CNA

github.com/headroomlabs-ai/headroom/pull/2207 issue-trackingpatch
github.com/headroomlabs-ai/headroom/blob/v0.29.0/headroom/proxy/handlers/openai.py technical-description
github.com/headroomlabs-ai/headroom/blob/v0.36.1/headroom/proxy/upstream_guard.py technical-description
github.com/headroomlabs-ai/headroom product
www.vulncheck.com/advisories/headroom-proxy-sends-upstream-requests-to-a-client-supplied-base-url-without-address-validation third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.