PatchTheCVECVE-2018-20349: The igraph_i_strdiff function in igraph_trie.c in igraph through 0.7.1 has an NULL pointer dereference that al
CVE-2018-20349 is a medium-severity flaw (CVSS 6.5) affecting igraph. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.5 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 1.6% (top 24%) |
| CISA exploited list | No |
| Weakness | CWE-476 |
| Published | 2018-12-22 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2018-20349?
igraph: upgrade to newer than 0.7.1. Exact commands for each OS are on this page.
Is CVE-2018-20349 being exploited?
CVE-2018-20349 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2018-20349 affect?
CVE-2018-20349 affects igraph. Severity is medium (CVSS 6.5). 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.
How urgent is CVE-2018-20349?
Priority 47/100. Public exploit reference