CVE-2026-31976 details a critical supply chain compromise (tag poisoning, CWE-506) affecting the xygeni/xygeni-action GitHub Action. An attacker, using compromised GitHub App credentials, manipulated the mutable @v5 tag to point to a malicious commit containing obfuscated shell code. This vulnerability carries a CVSS score of 9.8 (Critical) due to its network-based attack vector, low complexity, and lack of required privileges or user interaction, enabling arbitrary command execution and C2 implant deployment on CI runners with high impact on confidentiality, integrity, and availability. Despite its severity, there is currently no evidence of active exploitation, public exploit code, or significant community/media attention, as indicated by its absence from the CISA KEV catalog and a very low EPSS score.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 5.38.0, <= 6.4.0CPE matchmatch criteria | cpe:2.3:a:xygeni:xygeni-action:*:*:*:*:*:*:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.