CVE-2026-76243
stigmem before 0.9.0a2 Authentication Bypass via Disabled Auth
CVE-2026-76243 is a critical vulnerability (CVSS 9.2) in Eidetic-labs Stigmem, published May 29, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.56%, the 47th percentile. Fixed in stigmem-node 0.9.0a2.
- Severity
- 9.2 CriticalCVSS 4.0, CVE List
- Exploit chance
- 0.56%EPSS, 47th percentile
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
0.9.0a2stigmem-node +1 more
Description
stigmem versions before 0.9.0a2 allow unauthenticated access when authentication is disabled on non-loopback deployments. Attackers can perform read, write, and federation operations with anonymous identity when nodes are exposed outside local development environments.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
stigmem-nodePyPI | before 0.9.0a2 | 0.9.0a2 |
stigmem-nodePyPI | before 0.9.0a2, plus listed versions 0.9.0a1 | 0.9.0a2 |
What each source reports
CVE List Score used
stigmem before 0.9.0a2 Authentication Bypass via Disabled Auth
stigmem versions before 0.9.0a2 allow unauthenticated access when authentication is disabled on non-loopback deployments. Attackers can perform read, write, and federation operations with anonymous identity when nodes are exposed outside local development environments.
- Record
CVE-2026-76243- CVSS 4.0
- 9.2 Critical
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - Weakness
- CWE-285
- Updated
- 2026-11-02
EUVDEUVD-2026-62407
stigmem versions before 0.9.0a2 allow unauthenticated access when authentication is disabled on non-loopback deployments. Attackers can perform read, write, and federation operations with anonymous identity when nodes are exposed outside local development environments.
- Record
EUVD-2026-62407- CVSS 4.0
- 9.2 Critical
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-fp6w-8wpg-74g5
stigmem-node: Auth-disabled deployments may grant broad anonymous access outside loopback
Impact
Stigmem nodes configured with authentication disabled could grant the anonymous identity broad read/write/federation capabilities if exposed outside a loopback-only local development environment. Impacted users are operators who intentionally disabled authentication while binding the node to a non-loopback URL.
Patches
Patched in 0.9.0a2. The node now refuses unauthenticated operation outside loopback-only local development.
Workarounds
Before upgrading, keep authentication enabled for all non-local deployments and do not expose nodes with authentication disabled to untrusted networks.
Upgrade
Upgrade to the patched release:
pip install --upgrade --pre stigmem-node
If developers install through the Stigmem meta-package instead, they should use the matching extra for their deployments, for example:
pip install --upgrade --pre 'stigmem[node]'
Resources
- Record
GHSA-fp6w-8wpg-74g5- CVSS 4.0
- 9.2 Critical
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - Weakness
- CWE-285, CWE-862
- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-rqm4-4g3h-95wm
stigmem versions before 0.9.0a2 allow unauthenticated access when authentication is disabled on...
stigmem versions before 0.9.0a2 allow unauthenticated access when authentication is disabled on non-loopback deployments. Attackers can perform read, write, and federation operations with anonymous identity when nodes are exposed outside local development environments.
- Record
GHSA-rqm4-4g3h-95wm- CVSS 4.0
- 9.2 Critical
CVSS:4.0/AV:N/AC:L/AT:P/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 - Weakness
- CWE-285
- Updated
- 2026-11-02
NVD
stigmem versions before 0.9.0a2 allow unauthenticated access when authentication is disabled on non-loopback deployments. Attackers can perform read, write, and federation operations with anonymous identity when nodes are exposed outside local development environments.
- Record
CVE-2026-76243- CVSS 4.0
- 9.2 Critical
CVSS:4.0/AV:N/AC:L/AT:P/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 - Weakness
- CWE-285
- Updated
- 2026-11-02
OSV
stigmem before 0.9.0a2 Authentication Bypass via Disabled Auth
stigmem versions before 0.9.0a2 allow unauthenticated access when authentication is disabled on non-loopback deployments. Attackers can perform read, write, and federation operations with anonymous identity when nodes are exposed outside local development environments.
- Record
CVE-2026-76243- CVSS 4.0
- 9.2 Critical
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - Weakness
- CWE-285
- Updated
- 2026-11-02
OSVGHSA-fp6w-8wpg-74g5
stigmem-node: Auth-disabled deployments may grant broad anonymous access outside loopback
Impact
Stigmem nodes configured with authentication disabled could grant the anonymous identity broad read/write/federation capabilities if exposed outside a loopback-only local development environment. Impacted users are operators who intentionally disabled authentication while binding the node to a non-loopback URL.
Patches
Patched in 0.9.0a2. The node now refuses unauthenticated operation outside loopback-only local development.
Workarounds
Before upgrading, keep authentication enabled for all non-local deployments and do not expose nodes with authentication disabled to untrusted networks.
Upgrade
Upgrade to the patched release:
pip install --upgrade --pre stigmem-node
If developers install through the Stigmem meta-package instead, they should use the matching extra for their deployments, for example:
pip install --upgrade --pre 'stigmem[node]'
Resources
- Record
GHSA-fp6w-8wpg-74g5- CVSS 4.0
- 9.2 Critical
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - Weakness
- CWE-285, CWE-862
- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
References
github.com/eidetic-labs/stigmem/security/advisories/GHSA-fp6w-8wpg-74g5
vulncheck.com/advisories/stigmem-before-0a2-authentication-bypass-via-disabled-auth