CVE catalog
CVE-2026-33930
Apache Traffic Server copies the client Host header into a fixed-size stack buffer without a bound during redirect handling, so an over-long Host header overflows the stack when redirect following is
- Severity
- High · CVSS 8.2
CVSS:4.0/AV:N/AC:L/AT:P/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 - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.58% · Oct 25, 2026
Apache Traffic Server copies the client Host header into a fixed-size stack buffer without a bound during redirect handling, so an over-long Host header overflows the stack when redirect following is enabled. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.
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 | trafficserver | bookworm | 9.2.5+ds-0+deb12u4 | vulnerable |
| Debian | trafficserver | bookworm-security | 9.2.5+ds-0+deb12u4 | vulnerable |
| Cpe | traffic_server | Not reported | 10.1.4 | fixed |
| Ubuntu | trafficserver | 16.04 | 5.3.0-2ubuntu1 | vulnerable |
| Ubuntu | trafficserver | 16.04 | 5.3.0-2ubuntu2 | vulnerable |
| Ubuntu | trafficserver | 18.04 | 7.0.0-5 | vulnerable |
| Ubuntu | trafficserver | 18.04 | 7.1.2+ds-2 | vulnerable |
| Ubuntu | trafficserver | 18.04 | 7.1.2+ds-2build1 | vulnerable |
| Ubuntu | trafficserver | 18.04 | 7.1.2+ds-3 | vulnerable |
| Ubuntu | trafficserver | pro | 8.1.1+ds-1.1 | vulnerable |
| Ubuntu | trafficserver | pro | 9.1.1+ds-2build1 | vulnerable |
| Ubuntu | trafficserver | pro | 9.1.1+ds-2ubuntu0.1~esm1 | vulnerable |
| Ubuntu | trafficserver | pro | 9.1.1+ds-2ubuntu0.1 | vulnerable |
| Ubuntu | trafficserver | pro | 9.1.1+ds-2ubuntu0.1+esm1 | vulnerable |
| Ubuntu | trafficserver | 24.04 | 9.2.1+ds-1build1 | vulnerable |
| Ubuntu | trafficserver | 24.04 | 9.2.2+ds-1 | vulnerable |
| Ubuntu | trafficserver | 24.04 | 9.2.3+ds-1 | vulnerable |
| Ubuntu | trafficserver | 24.04 | 9.2.3+ds-1+deb12u1 | vulnerable |
| Ubuntu | trafficserver | 24.04 | 9.2.3+ds-1+deb12u1build1 | vulnerable |
| Ubuntu | trafficserver | 24.04 | 9.2.3+ds-1+deb12u1build3 | vulnerable |
| Ubuntu | trafficserver | 24.04 | 9.2.3+ds-1+deb12u1build4 | vulnerable |
| Ubuntu | trafficserver | 24.04 | 9.2.3+ds-1+deb12u1ubuntu0.1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | trafficserver | source | bookworm | (unfixed) | not yet assigned | Not reported | [1143062] |
| Cpe | traffic_server | cpe | Not reported | 10.1.4 | Not reported | NVD-CVE-2026-33930 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [trafficserver]Affected
Details (4)
9.2.5+ds-0+deb12u4· amd64 · bookwormAffected
nvd · trafficserver · debian · bookworm; nvd · trafficserver · debian · 12
9.2.5+ds-0+deb12u4· arm64 · bookwormAffected
nvd · trafficserver · debian · bookworm; nvd · trafficserver · debian · 12
9.2.5+ds-0+deb12u4· amd64 · bookworm-securityAffected
nvd · trafficserver · debian · bookworm; nvd · trafficserver · debian · 12
9.2.5+ds-0+deb12u4· arm64 · bookworm-securityAffected
nvd · trafficserver · debian · bookworm; nvd · trafficserver · debian · 12
- [trafficserver-dev]Affected
Source package: [trafficserver]
Details (4)
9.2.5+ds-0+deb12u4· amd64 · bookwormAffected
nvd · trafficserver · debian · bookworm; nvd · trafficserver · debian · 12
9.2.5+ds-0+deb12u4· arm64 · bookwormAffected
nvd · trafficserver · debian · bookworm; nvd · trafficserver · debian · 12
9.2.5+ds-0+deb12u4· amd64 · bookworm-securityAffected
nvd · trafficserver · debian · bookworm; nvd · trafficserver · debian · 12
9.2.5+ds-0+deb12u4· arm64 · bookworm-securityAffected
nvd · trafficserver · debian · bookworm; nvd · trafficserver · debian · 12
- [trafficserver-experimental-plugins]Affected
Source package: [trafficserver]
Details (4)
9.2.5+ds-0+deb12u4· amd64 · bookwormAffected
nvd · trafficserver · debian · bookworm; nvd · trafficserver · debian · 12
9.2.5+ds-0+deb12u4· arm64 · bookwormAffected
nvd · trafficserver · debian · bookworm; nvd · trafficserver · debian · 12
9.2.5+ds-0+deb12u4· amd64 · bookworm-securityAffected
nvd · trafficserver · debian · bookworm; nvd · trafficserver · debian · 12
9.2.5+ds-0+deb12u4· arm64 · bookworm-securityAffected
nvd · trafficserver · debian · bookworm; nvd · trafficserver · debian · 12
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-33930]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-33930]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-33930]
- [https://security-tracker.debian.org/tracker/CVE-2026-33930]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33930.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2561.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]