Description
ModSecurity 3.x before 3.0.4 mishandles key-value pair parsing, as demonstrated by a "string index out of range" error and worker-process crash for a "Cookie: =abc" header.
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 | modsecurity | 3.0.4-1 | — |
| Debian 13 | modsecurity | 3.0.4-1 | — |
| Debian 12 | modsecurity | 3.0.4-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | modsecurity | No fix yet | — |
| Ubuntu 26.04 LTS | modsecurity | No fix yet | — |
| Ubuntu 25.10 | modsecurity | No fix yet | — |
| Ubuntu 24.04 LTS | modsecurity | No fix yet | — |
| Ubuntu 22.04 LTS | modsecurity | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | modsecurity | No fix yet | — |