Vulnerability · CVE-2026-22903
An unauthenticated remote attacker can send a crafted HTTP request containing an overly long SESSIONID cookie.
Published Feb 9, 2026 · catalog updated Feb 9, 2026 · WAGO
Last checked Nov 4, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-22903. EPSS is 0.76%. Act only if a listed version of WAGO is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2026-22905 · High
- CVE-2026-22904 · Critical
- Severity
- Critical9.8
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.76%
- Remediation
- Vendor / distro source
- Affected products
- vendor WAGO 0852-1328 2.64
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- vendor WAGO 0852-1328 2.642.64
How to fix CVE-2026-22903
No stored fix
No vendor fix text is stored. Use the linked advisory before you change production.
Version check
Seen in 2.64
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-22903. EPSS is 0.76%. Act only if a listed version of WAGO is installed.
Which versions are affected?
Compare what you have installed with WAGO 0852-1328 2.64 2.64. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 0.76%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Feb 9, 2026 · EUVD
Detected
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.
Feb 9, 2026 · EUVD
Updated
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.
Sources
- CVE.orgVulnerability recordCVE-2026-22903
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-22903
30-day exploitation probability 0.76%
first.org - EUVDVulnerability recordEUVD-2026-6925
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 protect
euvd.enisa.europa.eu
References
Freshness
Last verified in this catalog Nov 4, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSNov 4, 2026
- CVE.orgNov 4, 2026
- EUVDNov 3, 2026