Description
The igraph_i_strdiff function in igraph_trie.c in igraph through 0.7.1 has an NULL pointer dereference that allows attackers to cause a denial of service (application crash) via a crafted object.
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 | igraph | 0.7.1-3 | — |
| Debian 14 | r-cran-igraph | 1.2.2-2 | — |
| Debian 13 | igraph | 0.7.1-3 | — |
| Debian 13 | r-cran-igraph | 1.2.2-2 | — |
| Debian 12 | igraph | 0.7.1-3 | — |
| Debian 12 | r-cran-igraph | 1.2.2-2 | — |
| Debian 8 | igraph | 0.7.1-2+deb8u1 | DLA-2055-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | igraph | 0.7.1-2.1+deb9u1build0.18.04.1 | USN-4644-1 |
| Ubuntu 16.04 LTS | igraph | 0.7.1-2.1+deb9u1build0.16.04.1 | USN-4644-1 |
Advisories 2
- USN-4644-1 igraph vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-2055-1 igraph - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://github.com/igraph/igraph/issues/1141
- FEDORA-2019-060e7b383c vendor-advisory
- FEDORA-2019-5d52865475 vendor-advisory
- [debian-lts-announce] 20191231 [SECURITY] [DLA 2055-1] igraph security update mailing-list