CVE-2026-121561: HumanSignal label-studio

Affected products, as the CNA wrote them
Vendor	Product	Versions
HumanSignal	label-studio pkg:pypi/label-studio	affected before 1.23.2 semver Other versions: unaffected
HumanSignal	label-studio-sdk pkg:pypi/label-studio-sdk	affected before 2.1.2 semver Other versions: unaffected

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

CISA KEV Not listed.
EPSS 0.0043, the 37th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

3 Nov 2026, 15:17 UTC Confirmed by the CVE List
3 Nov 2026, 15:23 UTC First seen by agentprime
3 Nov 2026, 16:17 UTC Confirmed by NVD

Sources

CVE List: CVE-2026-121561
NVD: CVE-2026-121561

References from the CNA

github.com/HumanSignal/label-studio/security/advisories/GHSA-6437-7wc6-gmx5 vendor-advisory
github.com/HumanSignal/label-studio/commit/df96d79183156e556d91825d15fa7721f1145e1a patch
github.com/HumanSignal/label-studio-sdk/commit/c20c899aaaa302740dacd46a47e5774bb677561f patch
github.com/HumanSignal/label-studio/blob/1.23.1/label_studio/data_export/models.py#L160-L167 technical-description
github.com/HumanSignal/label-studio-sdk/blob/2.1.1/src/label_studio_sdk/_extensions/label_studio_tools/core/utils/io.py#L62-L71 technical-description
github.com/HumanSignal/label-studio-sdk/blob/2.1.1/src/label_studio_sdk/_extensions/label_studio_tools/core/utils/io.py#L299-L338 technical-description
www.vulncheck.com/advisories/label-studio-before-1.23.2-ssrf-and-token-disclosure-via-image-export-downloads 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.