CVE catalog
CVE-2026-54388
Tinyproxy through 1.11.3, fixed in commit 364cdb6, fails to reject requests containing multiple Content-Length headers with differing values, forwarding all duplicate headers to the backend while usin
- Severity
- Critical · CVSS 9.3
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.44% · Oct 25, 2026
Tinyproxy through 1.11.3, fixed in commit 364cdb6, fails to reject requests containing multiple Content-Length headers with differing values, forwarding all duplicate headers to the backend while using the first value to determine how many request body bytes to consume. Remote attackers can desynchronize the proxy and backend parser state, allowing injection of arbitrary HTTP requests to the backend to enable cache poisoning, access control bypass, and request hijacking.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | tinyproxy | sid | 1.11.3-1 | vulnerable |
| Debian | tinyproxy | forky | 1.11.3-1 | vulnerable |
| Debian | tinyproxy | trixie | 1.11.2-1 | not affected |
| Debian | tinyproxy | bookworm | 1.11.1-2.1+deb12u1 | not affected |
| Debian | tinyproxy | bookworm-security | 1.11.1-2.1+deb12u1 | not affected |
| Cpe | tinyproxy | Not reported | Not reported | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | tinyproxy | source | sid | (unfixed) | not yet assigned | Not reported | [1140350] |
| Debian | tinyproxy | source | forky | (unfixed) | not yet assigned | Not reported | [1140350] |
| Debian | tinyproxy | source | trixie | Not affected | unimportant | Not reported | [1140350] |
| Debian | tinyproxy | source | bookworm | Not affected | unimportant | Not reported | [1140350] |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [tinyproxy]Not affected
Details (6)
1.11.1-2.1+deb12u1· all · bookwormNot affected
nvd · tinyproxy · debian · bookworm
1.11.1-2.1+deb12u1· all · bookwormNot affected
nvd · tinyproxy · debian · bookworm
1.11.2-1~bpo12+1· all · bookworm-backportsNot affected
nvd · tinyproxy · debian · bookworm
1.11.2-1~bpo12+1· all · bookworm-backportsNot affected
nvd · tinyproxy · debian · bookworm
1.11.1-2.1+deb12u1· all · bookworm-securityNot affected
nvd · tinyproxy · debian · bookworm
1.11.1-2.1+deb12u1· all · bookworm-securityNot affected
nvd · tinyproxy · debian · bookworm
- [tinyproxy-bin]Not affected
Source package: [tinyproxy]
Details (6)
1.11.1-2.1+deb12u1· amd64 · bookwormNot affected
nvd · tinyproxy · debian · bookworm
1.11.1-2.1+deb12u1· arm64 · bookwormNot affected
nvd · tinyproxy · debian · bookworm
1.11.2-1~bpo12+1· amd64 · bookworm-backportsNot affected
nvd · tinyproxy · debian · bookworm
1.11.2-1~bpo12+1· arm64 · bookworm-backportsNot affected
nvd · tinyproxy · debian · bookworm
1.11.1-2.1+deb12u1· amd64 · bookworm-securityNot affected
nvd · tinyproxy · debian · bookworm
1.11.1-2.1+deb12u1· arm64 · bookworm-securityNot affected
nvd · tinyproxy · debian · bookworm
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11060-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-54388]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-54388]
- [https://security-tracker.debian.org/tracker/CVE-2026-54388]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54388.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1999.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]