DEBIAN-CVE-2026-91920
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-91920
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-91920.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-91920
- Upstream
- CVE-2026-91920
- Published
- 2026-10-30T02:17:10Z
- Modified
- 2026-11-04T09:47:34Z
- Severity
-
- 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L CVSS Calculator
- Summary
- [none]
- Details
-
A flaw was found in the ChunkReader component of the Undertow web server, which is used to handle chunked transfer encoding in HTTP requests. The issue occurs because a security check for the chunk size is performed before the value is shifted, allowing a specifically crafted 15-digit chunk size to bypass the limit and overflow into internal state flags. This can cause the server to terminate a request body prematurely and interpret the remaining data as a separate, smuggled request.
- References
Affected packages
Debian:14 / undertow
Package
- Name
- undertow
- Purl
- pkg:deb/debian/undertow?arch=source&distro=forky
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Affected versions
1.*
1.3.4-1
1.3.5-1
1.3.7-1
1.3.11-1
1.3.16-1
1.3.19-1
1.3.21-1
1.3.23-1
1.4.0-1
1.4.1-1
1.4.3-1
1.4.4-1
1.4.6-1
1.4.7-1
1.4.8-1
1.4.18-1
1.4.20-1
1.4.21-1
1.4.21-2
1.4.22-1
1.4.23-1
1.4.23-2
1.4.23-3
1.4.25-1
1.4.25-2
2.*
2.0.23-1
2.0.25-1
2.0.26-1
2.0.27-1
2.0.28-1
2.0.29-1
2.0.30-1
2.1.0-1
2.1.1-1
2.1.3-1
2.2.0-1
2.2.2-1
2.2.3-1
2.2.4-1
2.2.5-1
2.2.8-1
2.2.10-1
2.2.12-1
2.2.13-1
2.2.14-1
2.2.16-1
2.2.17-1
2.2.18-1
2.2.19-1
2.2.20-1
2.2.21-1
2.3.8-1
2.3.8-2
2.3.18-1
2.3.18-2
2.3.20-1