CVE-2026-8767
CVE-2026-8767 — vercel ai PR Branch Name Interpolation prettier-on-automerge.yml run os command injection
A vulnerability has been found in vercel ai up to 3.0.97. Impacted is the function run of the file .github/workflows/prettier-on-automerge.yml of the component PR Branch Name Interpolation. The manipulation leads to os command injection. The attack can be initiated remotely. The complexity of an attack is rather high. The exploitability is considered difficult. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Published Updated Sources: cvelistV5, VulDB
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.
Exploitation
Unreported
no source claims exploitation
EPSS
4%
chance of exploitation in 30 days
CVSS base
5
MEDIUM
CISA SSVC assessment
Three decision points CISA publishes for the CVEs it assesses · SSVC 2.0.3. A stakeholder decision, not a severity score.
Exploitation
PoC
none · proof-of-concept · active
Automatable
No
can an attacker script all four kill-chain steps
Technical impact
Partial
partial · total control of the vulnerable component
Affected scope
The catalog records vendors and products as separate lists, not pairs, so which product belongs to which vendor is not something this page can say.
Vendors (1)
Products (1)
Every base score collected
Sources score independently and disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Source |
|---|---|---|---|---|---|
| 5 | CVSS 3.1 | MEDIUM | — | — | cvelistV5 |
Weakness & attack patterns
- CWE-78
- CWE-77
Detection
Read off the CVSS vector and the weakness class. Starting points, not rules we have tested.
- Search application, proxy, and WAF logs for requests touching /workflows/prettier-on-automerge.yml.
References
4 on the record
- vuldb.com/vuln/364392
vdb-entry, technical-description
- vuldb.com/vuln/364392/cti
signature, permissions-required
- vuldb.com/submit/811402
third-party-advisory
- gist.github.com/YLChen-007/870bd6966cd84703d91ce54dfea3bdd0
exploit
Elsewhere on this site
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.