Description
The DecodeHSTSPreloadRaw function in net/http/transport_security_state.cc in Google Chrome before 43.0.2357.130 does not properly canonicalize DNS hostnames before making comparisons to HSTS or HPKP preload entries, which allows remote attackers to bypass intended access restrictions via a string that (1) ends in a . (dot) character or (2) is not entirely lowercase.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | chromium-browser | 44.0.2403.89-1~deb8u1 | DSA-3315-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | chromium-browser | 43.0.2357.130-0ubuntu0.14.04.1.1092 | — |
| Ubuntu 14.04 LTS | oxide-qt | 1.7.9-0ubuntu0.14.04.1 | USN-2652-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | chromium-browser | 43.0.2357.130-1.el6_6 | RHSA-2015:1188 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | chromium | 55.0.2883.75-3.1 | openSUSE-SU-2024:12948-1, openSUSE-SU-2024:10171-1 |
Advisories 5
- RHSA-2015:1188 Red Hat Security Advisory: chromium-browser security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- DSA-3315-1 chromium-browser - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-2652-1 oxide-qt vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- openSUSE-SU-2024:10171-1 chromedriver-55.0.2883.75-3.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12948-1 ungoogled-chromium-113.0.5672.92-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- openSUSE-SU-2015:1872 vendor-advisory
- 1032731 vdb-entry
- 75336 vdb-entry
- https://codereview.chromium.org/1149753002
- USN-2652-1 vendor-advisory
- RHSA-2015:1188 vendor-advisory
- openSUSE-SU-2015:1146 vendor-advisory
- http://googlechromereleases.blogspot.com/2015/06/chrome-stable-update.html
- GLSA-201507-18 vendor-advisory
- https://code.google.com/p/chromium/issues/detail?id=461481
- DSA-3315 vendor-advisory