CVE-2026-123783: Skyvern-AI skyvern

Skyvern through 1.0.56 Script Sandbox Bypass via types.CodeType Bytecode

CVSS 8.7 HighEPSS 0.0056 · 46th percentile

Published by the CVE Program (CNA: VulnCheck) at 6 Nov 2026, 15:00 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
Skyvern-AI	skyvern pkg:pypi/skyvern	affected 1.0.56 and earlier semver Other versions: unaffected

Identifiers

CVE-2026-123783

CNA

VulnCheck

Weakness (CWE)

CWE-184

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

CISA KEV Not listed.
EPSS 0.0056, the 46th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

6 Nov 2026, 15:00 UTC Confirmed by the CVE List
6 Nov 2026, 15:17 UTC Confirmed by NVD
6 Nov 2026, 15:17 UTC First seen by agentprime

Sources

References from the CNA

github.com/Skyvern-AI/skyvern/issues/8927 issue-tracking
github.com/Skyvern-AI/skyvern product
github.com/Skyvern-AI/skyvern/pull/8937 issue-trackingpatch
github.com/Skyvern-AI/skyvern/commit/31a64c1a4b5dfaf1e76a7164845e10f2d68248dc patch
github.com/Skyvern-AI/skyvern/blob/v1.0.56/skyvern/forge/sdk/workflow/code_block_safety.py#L106-L142 technical-description
github.com/Skyvern-AI/skyvern/blob/v1.0.56/skyvern/forge/sdk/workflow/service.py#L1509-L1511 technical-description
www.vulncheck.com/advisories/skyvern-through-1.0.56-script-sandbox-bypass-via-types-codetype-bytecode 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.