Description
A vulnerability, which was classified as critical, has been found in GNU cflow up to 1.8. Affected by this issue is the function yylex of the file c.c of the component Lexer. The manipulation leads to buffer overflow. Local access is required to approach this attack. The exploit has been disclosed to the public and may be used.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GNU | cflow | 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8 | — |
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 | cflow | No fix yet | — |
| Debian 13 | cflow | No fix yet | — |
| Debian 12 | cflow | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | cflow | No fix yet | — |
| Ubuntu 26.04 LTS | cflow | No fix yet | — |
| Ubuntu 25.10 | cflow | No fix yet | — |
| Ubuntu 24.04 LTS | cflow | No fix yet | — |
| Ubuntu 22.04 LTS | cflow | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | cflow | No fix yet | — |
| Ubuntu Pro 18.04 LTS | cflow | No fix yet | — |
| Ubuntu Pro 16.04 LTS | cflow | No fix yet | — |
References
- VDB-319232 | GNU cflow Lexer c.c yylex buffer overflow vdb-entry technical-description
- VDB-319232 | CTI Indicators (IOB, IOC, IOA) signature permissions-required
- Submit #622329 | GNU cflow cflow cflow (GNU cflow) the newest master (0a19319e282506ff88d19e630380cd5069e893ed ) in cflow.git - GNU cflow Buffer Overflow third-party-advisory
- https://lists.gnu.org/archive/html/bug-cflow/2025-07/msg00001.html related
- https://drive.google.com/file/d/17lkJ5bSiQZoXLTg3bK-rGBt3kahN9Xse/view?usp=drive_link exploit
- https://www.gnu.org/ product