LOWPyPI →
Flask session does not add `Vary: Cookie` header when accessed in some ways
Flask session does not add `Vary: Cookie` header when accessed in some ways
Affected packages
- flask— before 3.1.3
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- —
- EPSS percentile
- —
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.
Sources
- https://github.com/pallets/flask/security/advisories/GHSA-68rp-wp8r-4726
- https://nvd.nist.gov/vuln/detail/CVE-2026-27205
- https://github.com/pallets/flask/commit/089cb86dd22bff589a4eafb7ab8e42dc357623b4
- https://github.com/pallets/flask
- https://github.com/pallets/flask/releases/tag/3.1.3
Structured record: https://osv.dev/vulnerability/GHSA-68rp-wp8r-4726
Recommended response stack
Snyk — Scan your dependencies in CI and fix this vulnerability.→Socket — Detect malicious and compromised packages before they ship.→
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