CVE-2026-76245 stigmem Federation Peer Token Timestamp Validation Bypass
Attackers can cause denial of service in authenticated federation flows by exploiting timestamp validation flaws in the stigmem library.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-76245?
CVE-2026-76245 is a high-severity authentication bypass vulnerability in eidetic-labs stigmem, published on 19 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
stigmem (pip package stigmem-node) version 0.9.0a1 contains a timestamp-handling mismatch in federation peer-token validation that can cause valid peer tokens to be incorrectly treated as expired. This affects the availability and reliability of authenticated federation flows on nodes using federation peer authentication paths. The issue is fixed in 0.9.0a2, which uses the canonical millisecond-based validation path.
Weakness: CWE-345
Which versions are affected by CVE-2026-76245?
2 open source packages ship an affected version, including stigmem-node.
| Package | Affected | Fixed in |
|---|---|---|
stigmem-node PyPI | All versions | 0.9.0a2 |
stigmem-node PyPI | All versions | 0.9.0a2 |
How do I fix CVE-2026-76245?
Upgrade stigmem-node to 0.9.0a2 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-76245 being exploited?
There is no known exploitation of CVE-2026-76245 in the wild and no public exploit code.
Sources
Also known as GHSA-rh24-296r-8rj6, GHSA-xh5j-xjfq-qvvx.