Description
An issue was discovered in the Tatsuya Kinoshita w3m fork before 0.5.3-31. Heap-based buffer overflow in w3m allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted HTML page.
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 14 | w3m | 0.5.3-30 | — |
| Debian 13 | w3m | 0.5.3-30 | — |
| Debian 12 | w3m | 0.5.3-30 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | w3m | 0.5.3-26ubuntu0.1 | — |
| Ubuntu 14.04 LTS | w3m | 0.5.3-15ubuntu0.1 | USN-3214-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP4 | w3m | 0.5.3.git20161120-4.1 | SUSE-SU-2016:3046-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 11 SP4 | w3m | 0.5.3.git20161120-4.1 | SUSE-SU-2016:3046-1 |
Advisories 2
- USN-3214-1 w3m vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2016:3046-1 Security update for w3m SUSE / openSUSE Security Updates · Feb 4, 2026