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TI-2026-18390 Aliases CVE-2026-22903GHSA-23jw-jg3f-6352

Stack Overflow via SESSIONID Cookie in lighttpd

Priority MEDIUM 50CWE-121Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

An unauthenticated remote attacker can send a crafted HTTP request containing an overly long SESSIONID cookie. This can trigger a stack buffer overflow in the modified lighttpd server, causing it to crash and potentially enabling remote code execution due to missing stack protections.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00759 55th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
WAGO0852-13220.0.0 – 2.64—No fix listedCNA
WAGO0852-13280.0.0 – 2.64—No fix listedCNA
WAGO0852-13222.64—No fix listedCNA
WAGO0852-13282.64—No fix listedCNA
  • 0852-1322 VendorWAGO Affected 0.0.0 – 2.64 Fixed in — No fix listed CNA
  • 0852-1328 VendorWAGO Affected 0.0.0 – 2.64 Fixed in — No fix listed CNA
  • 0852-1322 VendorWAGO Affected 2.64 Fixed in — No fix listed CNA
  • 0852-1328 VendorWAGO Affected 2.64 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-22903
  2. 2026-10-03 Alias added: GHSA-23jw-jg3f-6352

References

Other 1

  • TI-2023-01594 WAGO: WBM Command Injection in multiple products CVSS 3.1CRITICAL 9.8
  • TI-2020-06893 eap.c in pppd in ppp 2.4.2 through 2.4.8 has an rhostname buffer overflow in the eap_request and eap_response functions. CVSS 3.1CRITICAL 9.8
  • TI-2018-09314 An issue was discovered on WAGO e!DISPLAY 762-3000 through 762-3003 devices with firmware… CVSS 3.1HIGH 8.8
  • TI-2025-18921 Unauthenticated File Read via Web Interface CVSS 3.1MEDIUM 4.9
  • TI-2026-18391 Stack Overflow via Oversized Cookie Fields in lighttpd CVSS 3.1CRITICAL 9.8
  • TI-2026-03092 Hidden CLI Function Allows Root Access CVSS 3.1CRITICAL 10.0
See all 145 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences