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().
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Python Software Foundation | CPython | < 3.10.21, 3.11.0 – < 3.11.16, 3.12.0 – < 3.12.14, 3.13.0 – < 3.13.15, 3.14.0 – < 3.14.7, 3.15.0a1 – < 3.15.0rc1, 3.16.0a1 – < 3.16.0 | 3.10.21 |
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 | pypy3 | 8.0.1+dfsg-1 | — |
| Debian 14 | python3.14 | 3.14.7-1 | — |
| Debian 14 | python3.15 | 3.15.0~rc1-1 | — |
| Debian 13 | pypy3 +1 | No fix yet | — |
| Debian 12 | pypy3 | No fix yet | — |
| Debian 12 | python3.11 | 3.11.2-6+deb12u9 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | python3.14 | No fix yet | — |
| Ubuntu 26.04 LTS | python3.14 | No fix yet | — |
| Ubuntu 24.04 LTS | python3.12 | No fix yet | — |
| Ubuntu 22.04 LTS | python3.10 | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | python2.7 +1 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | python2.7 +2 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | python2.7 +3 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | python2.7 +1 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | python2.7 +2 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | python3 +15 | 3.14.7-1.hum1 | RHSA-2026:54534 |
| Red Hat Hardened Images 1 | python3.10 +6 | 3.10.21-1.hum1 | RHSA-2026:57010 |
| Red Hat Hardened Images 1 | python3.11 +6 | 3.11.16-1.hum1 | RHSA-2026:57660 |
| Red Hat Hardened Images 1 | python3.12 +6 | 3.12.14-1.hum1 | RHSA-2026:58420 |
| Red Hat Hardened Images 1 | python3.13 +8 | 3.13.15-1.hum1 | RHSA-2026:54554 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | python +1 | 2.7.18-150000.133.1 | SUSE-SU-2026:4411-1 |
| SLES 15 SP7 | python3 +1 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 |
| SLES 15 SP6 | python3 +1 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 |
| SLES 15 SP5 | python3 +1 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 |
| SLES 15 SP4 | python3 +1 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 |
| SLES 12 SP5 | python +2 | 2.7.18-33.88.1 | SUSE-SU-2026:4633-1 |
| SLES 12 SP5 | python3 +1 | 3.4.10-25.199.1 | SUSE-SU-2026:4744-1 |
| SLES 12 SP5 | python36 +1 | 3.6.15-125.1 | SUSE-SU-2026:4743-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 3 | python313 +1 | 3.13.15-150700.4.56.1 | SUSE-SU-2026:4401-1 |
| SLES for SAP 15 SP6 | python3 +1 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 |
| SLES for SAP 15 SP5 | python3 +1 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 |
| SLES for SAP 15 SP4 | python3 +1 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 |
| SLE Micro 5.5 | python3 +1 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 |
| SLE Micro 5.4 | python3 +1 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 |
| SLE Micro 5.3 | python3 +1 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 |
| SLE HPC 15 SP5 | python3 +1 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 |
| SLE HPC 15 SP4 | python3 +1 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | python313 | 3.13.15-1.1 | openSUSE-SU-2026:11817-1 |
| openSUSE Tumbleweed | python315 | 3.15.0~rc2-1.1 | openSUSE-SU-2026:11748-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | python3.11 +6 | 3.11.16-1.amzn2023.0.1 | ALAS2023-2026-2125 |
| Amazon Linux 2023 | python3.12 +6 | 3.12.14-2.amzn2023.0.1 | ALAS2023-2026-2124 |
| Amazon Linux 2023 | python3.13 +8 | 3.13.15-1.amzn2023.0.1 | ALAS2023-2026-2123 |
| Amazon Linux 2023 | python3.14 +13 | 3.14.7-1.amzn2023.0.1 | ALAS2023-2026-2122 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | docbook5-style-xsl | No fix yet | — |
| Azure Linux 3 | python3 | 3.12.14-1 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | python-3.10 | 3.10.21-r0 | — |
| Wolfi rolling | python-3.11 | 3.11.16-r0 | — |
| Wolfi rolling | python-3.12 | 3.12.14-r0 | — |
Advisories 18
- SSA-457936 SSA-457936: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.7 Siemens ProductCERT · Nov 10, 2026
- SUSE-SU-2026:4754-1 Security update for python3 SUSE / openSUSE Security Updates · Oct 21, 2026
- SUSE-SU-2026:4743-1 Security update for python36 SUSE / openSUSE Security Updates · Oct 20, 2026
- SUSE-SU-2026:4744-1 Security update for python3, python3-base, python3-doc SUSE / openSUSE Security Updates · Oct 20, 2026
- RHSA-2026:54554 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:54534 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- SUSE-SU-2026:4633-1 Security update for python SUSE / openSUSE Security Updates · Oct 13, 2026
- RHSA-2026:57010 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 6, 2026
- RHSA-2026:57660 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 6, 2026
- RHSA-2026:58420 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 6, 2026
- SUSE-SU-2026:4411-1 Security update for python SUSE / openSUSE Security Updates · Oct 2, 2026
- SUSE-SU-2026:4401-1 Security update for python313 SUSE / openSUSE Security Updates · Oct 1, 2026
- openSUSE-SU-2026:11817-1 python313-3.13.15-1.1 on GA media SUSE / openSUSE Security Updates · Sep 19, 2026
- openSUSE-SU-2026:11748-1 python315-3.15.0~rc2-1.1 on GA media SUSE / openSUSE Security Updates · Sep 11, 2026
- ALAS2023-2026-2123 Low: python3.13 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 31, 2026
- ALAS2023-2026-2124 Low: python3.12 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 31, 2026
- ALAS2023-2026-2125 Low: python3.11 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 31, 2026
- ALAS2023-2026-2122 Low: python3.14 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 31, 2026
References
- https://mail.python.org/archives/list/security-announce@python.org/thread/KQ7NBMCPAZJHRROQXJQE4GMXGLD5KHBS/ vendor-advisory
- https://github.com/python/cpython/pull/153694 patch
- https://github.com/python/cpython/issues/98820 issue-tracking
- https://github.com/python/cpython/commit/063d4555c94ef412c731527dbf30193327f2ee82 patch
- https://github.com/python/cpython/commit/476fb09cdb0d73e645849d98c610e7e5697ce7c9 patch
- https://github.com/python/cpython/commit/89f29c760c02774b099ddd6863268eb13fa3946a patch
- https://github.com/python/cpython/commit/b30c7fa9edd921a118f286e9f90f560777fa693b patch
- https://github.com/python/cpython/commit/b09a67a20c464f8288c9f9a6b9c7082a74560024 patch
- https://github.com/python/cpython/commit/fd78b565d7c326f96ae903ab945b47f35d829cf4 patch