A resource leak in gw_backend.c in lighttpd 1.4.56 through 1.4.66 could lead to a denial…
Priority LOW 39CWE-401Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-401.
Summary
A resource leak in gw_backend.c in lighttpd 1.4.56 through 1.4.66 could lead to a denial of service (connection-slot exhaustion) after a large amount of anomalous TCP behavior by clients. It is related to RDHUP mishandling in certain HTTP/1.1 chunked situations. Use of mod_fastcgi is, for example, affected. This is fixed in 1.4.67.
Why it matters now
EPSS 0.0383 90th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:lighttpd:lighttpd:*:*:*:*:*:*:*:* | 1.4.56 to before 1.4.67 | Vulnerable | lighttpd |
| cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* | 35 | Vulnerable | Fedoraproject |
- cpe:2.3:a:lighttpd:lighttpd:*:*:*:*:*:*:*:* Versions 1.4.56 to before 1.4.67 Vulnerable ·lighttpd
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* Versions 35 Vulnerable ·Fedoraproject
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2022-41556
- 2026-10-03 Alias added: GHSA-jm88-vr5q-23rj
- 2026-10-28 EPSS moved to the 90th–95th percentile
References
Sources
- CVE-2022-41556 · CVE Program
- CVE-2022-41556 · NVD
- FIRST EPSS
- GHSA-jm88-vr5q-23rj · GitHub Advisory Database · CC BY 4.0
- CVE-2022-41556 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences