# CVE-2026-84155: Session Token Remains Valid After Logout in Multi-Worker Deployments

Status: published. Published: 2026-11-06. Updated: 2026-11-06.

CodeChecker's web server fails to fully invalidate a session token on logout when the server runs with more than one API worker process (the default). Each worker process maintains its own
in-memory session cache; logout only clears the cache of the single worker that handles the request (plus the shared database record). Other workers continue to honor the destroyed token
from their stale in-memory copies until the session's lifetime expires. An attacker who has captured a valid token can therefore keep impersonating the user after the user has logged out.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Ericsson / CodeChecker: ≥ 0; < 6.29.3 (affected, semver); unaffected at 6.29.3. Source: CNA: ERIC

## Severity and prioritization

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N; source: CNA: ERIC

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/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; source: NVD: 85b1779b-6ecd-4f52-bcc5-73eac4659dcf

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-613

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/Ericsson/codechecker/security/advisories/GHSA-r42x-9wgw-cqc2 (CNA: ERIC)

- https://github.com/Ericsson/codechecker/security/advisories/GHSA-r42x-9wgw-cqc2 (85b1779b-6ecd-4f52-bcc5-73eac4659dcf)

## Provenance

- CNA: ERIC: https://www.cve.org/CVERecord?id=CVE-2026-84155; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-84155; retrieved 2026-11-06; source updated 2026-11-06

Revision: b5957f47e19cbc6920e54e1e94501bb57e7339eac21a7e13e174aff0b317350b

Canonical: https://y2.dev/cve/CVE-2026-84155

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.