CVE-2026-18503
Published: August 14, 2026Last modified: August 25, 2026
Description
Attacker-controlled CSV samples can trigger super-linear regular-expression work during dialect sniffing and consume significant CPU when applications pass unbounded input to csv.Sniffer.sniff().
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | python3 | Fixed (3.11.16-r0) |
| 25 LTS | python3 | Fixed (3.12.14-r0) | |
| Stream | python3 | Unknown (3.11.4-r0) | |
| Hardened Containers | 23 LTS | python3 | Fixed (3.11.16-r0) |
| 25 LTS | python3 | Fixed (3.12.14-r0) | |
| Stream | python3 | Unknown (3.11.4-r0) |
References
- https://github.com/python/cpython/commit/063d4555c94ef412c731527dbf30193327f2ee82
- https://github.com/python/cpython/commit/476fb09cdb0d73e645849d98c610e7e5697ce7c9
- https://github.com/python/cpython/commit/89f29c760c02774b099ddd6863268eb13fa3946a
- https://github.com/python/cpython/commit/b09a67a20c464f8288c9f9a6b9c7082a74560024
- https://github.com/python/cpython/commit/b30c7fa9edd921a118f286e9f90f560777fa693b
- https://github.com/python/cpython/commit/fd78b565d7c326f96ae903ab945b47f35d829cf4
- https://github.com/python/cpython/issues/98820
- https://github.com/python/cpython/pull/153694
- https://mail.python.org/archives/list/[email protected]/thread/KQ7NBMCPAZJHRROQXJQE4GMXGLD5KHBS/