#1147450 pypy3: CVE-2026-18503

Package:
src:pypy3
Source:
src:pypy3
Submitter:
Moritz Mühlenhoff
Date:
2026-10-27 14:31:02 UTC
Severity:
normal
Tags:
#1147450#5
Date:
2026-09-11 20:46:10 UTC
From:
To:
Hi,

The following vulnerability was published for pypy3.

CVE-2026-18503[0]:
| 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().

https://mail.python.org/archives/list/security-announce@python.org/thread/KQ7NBMCPAZJHRROQXJQE4GMXGLD5KHBS/
https://github.com/python/cpython/issues/98820
https://github.com/python/cpython/pull/153694

Fixed by: https://github.com/python/cpython/commit/476fb09cdb0d73e645849d98c610e7e5697ce7c9 (v3.15.0rc1)


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-18503
https://www.cve.org/CVERecord?id=CVE-2026-18503

Please adjust the affected versions in the BTS as needed.
#1147450#12
Date:
2026-10-27 14:30:08 UTC
From:
To:
This was fixed in sid.

I'll send an MR for the security-tracker.

Stefano