CVE-2026-7210
critical
CVSS v3
9.8
CVSS v2
—
VIR risk
9.8
Description
`xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\r\n\r\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.
Predictions
Exploit likelihood
97%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-7210
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2026-7210.html
Vendor advisory: cna@python.org — https://github.com/python/cpython/pull/149023
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | affected | |
| debian | bullseye | affected | |
| debian | forky | affected | |
| debian | sid | affected | |
| debian | trixie | affected | |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| libexpat_project | libexpat | {"endExcluding":"2.8.0"} | 2.8.0 |
References
- https://github.com/python/cpython/issues/149018
- https://github.com/python/cpython/pull/149023
- https://mail.python.org/archives/list/security-announce@python.org/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/
- http://www.openwall.com/lists/oss-security/2026/05/11/13
- http://www.openwall.com/lists/oss-security/2026/05/11/8
- https://www.suse.com/security/cve/CVE-2026-7210.html
- https://security-tracker.debian.org/tracker/CVE-2026-7210
CWEs
CWE-331
Verify integrity in audit chain (admin only). AS-IS.