DEBIAN-CVE-2026-31842

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Source
https://security-tracker.debian.org/tracker/CVE-2026-31842
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-31842.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-31842
Upstream
  • CVE-2026-31842
Published
2026-04-07T12:16:21.040Z
Modified
2026-04-28T20:31:34.738024Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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 CVSS Calculator
Summary
[none]
Details

Tinyproxy through 1.11.3 is vulnerable to HTTP request parsing desynchronization due to a case-sensitive comparison of the Transfer-Encoding header in src/reqs.c. The ischunkedtransfer() function uses strcmp() to compare the header value against "chunked", even though RFC 7230 specifies that transfer-coding names are case-insensitive. By sending a request with Transfer-Encoding: Chunked, an unauthenticated remote attacker can cause Tinyproxy to misinterpret the request as having no body. In this state, Tinyproxy sets contentlength.client to -1, skips pullclientdatachunked(), forwards request headers upstream, and transitions into relay_connection() raw TCP forwarding while unread body data remains buffered. This leads to inconsistent request state between Tinyproxy and backend servers. RFC-compliant backends (e.g., Node.js, Nginx) will continue waiting for chunked body data, causing connections to hang indefinitely. This behavior enables application-level denial of service through backend worker exhaustion. Additionally, in deployments where Tinyproxy is used for request-body inspection, filtering, or security enforcement, the unread body may be forwarded without proper inspection, resulting in potential security control bypass.

References

Affected packages

Debian:11 / tinyproxy

Package

Name
tinyproxy
Purl
pkg:deb/debian/tinyproxy?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.10.0-5
1.10.0-5+deb11u1
1.11.0-1~bpo11+1
1.11.0-1
1.11.1-1~bpo11+1
1.11.1-1
1.11.1-2~bpo11+1
1.11.1-2
1.11.1-2.1
1.11.1-3
1.11.1-4
1.11.2-1~bpo12+1
1.11.2-1
1.11.3-1~bpo13+1
1.11.3-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-31842.json"

Debian:12 / tinyproxy

Package

Name
tinyproxy
Purl
pkg:deb/debian/tinyproxy?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.11.1-2.1
1.11.1-2.1+deb12u1
1.11.1-3
1.11.1-4
1.11.2-1~bpo12+1
1.11.2-1
1.11.3-1~bpo13+1
1.11.3-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-31842.json"

Debian:13 / tinyproxy

Package

Name
tinyproxy
Purl
pkg:deb/debian/tinyproxy?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.11.2-1
1.11.3-1~bpo13+1
1.11.3-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-31842.json"

Debian:14 / tinyproxy

Package

Name
tinyproxy
Purl
pkg:deb/debian/tinyproxy?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.11.2-1
1.11.3-1~bpo13+1
1.11.3-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-31842.json"