Description
Use-after-free vulnerability in the Web Workers implementation in Mozilla Firefox before 3.5.17 and 3.6.x before 3.6.14, and SeaMonkey before 2.0.12, allows remote attackers to execute arbitrary code via vectors related to a JavaScript Worker and garbage collection.
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 6.0 | iceape | 2.0.11-3 | DSA-2180-1 |
| Debian 6.0 | icedove | 3.0.11-1+squeeze1 | DSA-2187-1 |
| Debian 6.0 | iceweasel | 3.5.16-5 | DSA-2186-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | firefox | 3.6.14-4.el6_0 | RHSA-2011:0310 |
| RHEL 6 | xulrunner +1 | 1.9.2.14-3.el6_0 | RHSA-2011:0310 |
| RHEL 5 | firefox | 3.6.14-4.el5_6 | RHSA-2011:0310 |
| RHEL 5 | xulrunner +1 | 1.9.2.14-4.el5_6 | RHSA-2011:0310 |
| RHEL 4 | firefox | 3.6.14-4.el4 | RHSA-2011:0310 |
Advisories 4
- RHSA-2011:0310 Red Hat Security Advisory: firefox security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- DSA-2180-1 iceape - several Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-2186-1 iceweasel - several Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-2187-1 icedove - several Debian Security (DSA / DLA) · Mar 9, 2026