Description
An issue was discovered in FlightCrew v0.9.2 and earlier. A NULL pointer dereference occurs in GetRelativePathToNcx() or GetRelativePathsToXhtmlDocuments() when a NULL pointer is passed to xc::XMLUri::isValidURI(). This affects third-party software (not Sigil) that uses FlightCrew as a library.
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 | flightcrew | 0.7.2+dfsg-14 | — |
| Debian 13 | flightcrew | 0.7.2+dfsg-14 | — |
| Debian 12 | flightcrew | 0.7.2+dfsg-14 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | flightcrew | 0.7.2+dfsg-10ubuntu0.1 | USN-4055-1 |
| Ubuntu 16.04 LTS | flightcrew | 0.7.2+dfsg-6ubuntu0.1 | USN-4055-1 |
Advisories 1
- USN-4055-1 flightcrew vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026