CVE-2026-82209 PUBLISHED

domain-scoped PSL domain cookie

Assigner: curl
Reserved: 28.08.2026 Published: 06.09.2026 Updated: 06.09.2026

When libpsl support is enabled, libcurl fails to enforce the Public Suffix List boundary check when processing a Set-Cookie header where the Domain attribute explicitly matches an origin host that is itself a public suffix (e.g., Domain=co.uk set by co.uk).

Instead of coercing it into a strict host-only cookie, libcurl saves the cookie with wildcard domain scope (.co.uk). Consequently, the cookie is inappropriately included in subsequent outbound requests or HTTP redirects to arbitrary sibling subdomains under the same public suffix (e.g., attacker.co.uk).

Product Status

Vendor curl
Product curl
Versions Default: unaffected
  • affected from 8.21.0 to 8.21.0 (incl.)
  • affected from 8.20.0 to 8.20.0 (incl.)
  • affected from 8.19.0 to 8.19.0 (incl.)
  • affected from 8.18.0 to 8.18.0 (incl.)
  • affected from 8.17.0 to 8.17.0 (incl.)
  • affected from 8.16.0 to 8.16.0 (incl.)
  • affected from 8.15.0 to 8.15.0 (incl.)
  • affected from 8.14.1 to 8.14.1 (incl.)
  • affected from 8.14.0 to 8.14.0 (incl.)
  • affected from 8.13.0 to 8.13.0 (incl.)
  • affected from 8.12.1 to 8.12.1 (incl.)
  • affected from 8.12.0 to 8.12.0 (incl.)
  • affected from 8.11.1 to 8.11.1 (incl.)
  • affected from 8.11.0 to 8.11.0 (incl.)
  • affected from 8.10.1 to 8.10.1 (incl.)
  • affected from 8.10.0 to 8.10.0 (incl.)
  • affected from 8.9.1 to 8.9.1 (incl.)
  • affected from 8.9.0 to 8.9.0 (incl.)
  • affected from 8.8.0 to 8.8.0 (incl.)
  • affected from 8.7.1 to 8.7.1 (incl.)
  • affected from 8.7.0 to 8.7.0 (incl.)
  • affected from 8.6.0 to 8.6.0 (incl.)
  • affected from 8.5.0 to 8.5.0 (incl.)
  • affected from 8.4.0 to 8.4.0 (incl.)
  • affected from 8.3.0 to 8.3.0 (incl.)
  • affected from 8.2.1 to 8.2.1 (incl.)
  • affected from 8.2.0 to 8.2.0 (incl.)
  • affected from 8.1.2 to 8.1.2 (incl.)
  • affected from 8.1.1 to 8.1.1 (incl.)
  • affected from 8.1.0 to 8.1.0 (incl.)
  • affected from 8.0.1 to 8.0.1 (incl.)
  • affected from 8.0.0 to 8.0.0 (incl.)
  • affected from 7.88.1 to 7.88.1 (incl.)
  • affected from 7.88.0 to 7.88.0 (incl.)
  • affected from 7.87.0 to 7.87.0 (incl.)
  • affected from 7.86.0 to 7.86.0 (incl.)
  • affected from 7.85.0 to 7.85.0 (incl.)
  • affected from 7.84.0 to 7.84.0 (incl.)
  • affected from 7.83.1 to 7.83.1 (incl.)
  • affected from 7.83.0 to 7.83.0 (incl.)
  • affected from 7.82.0 to 7.82.0 (incl.)
  • affected from 7.81.0 to 7.81.0 (incl.)
  • affected from 7.80.0 to 7.80.0 (incl.)
  • affected from 7.79.1 to 7.79.1 (incl.)
  • affected from 7.79.0 to 7.79.0 (incl.)
  • affected from 7.78.0 to 7.78.0 (incl.)
  • affected from 7.77.0 to 7.77.0 (incl.)
  • affected from 7.76.1 to 7.76.1 (incl.)
  • affected from 7.76.0 to 7.76.0 (incl.)
  • affected from 7.75.0 to 7.75.0 (incl.)
  • affected from 7.74.0 to 7.74.0 (incl.)
  • affected from 7.73.0 to 7.73.0 (incl.)
  • affected from 7.72.0 to 7.72.0 (incl.)
  • affected from 7.71.1 to 7.71.1 (incl.)
  • affected from 7.71.0 to 7.71.0 (incl.)
  • affected from 7.70.0 to 7.70.0 (incl.)
  • affected from 7.69.1 to 7.69.1 (incl.)
  • affected from 7.69.0 to 7.69.0 (incl.)
  • affected from 7.68.0 to 7.68.0 (incl.)
  • affected from 7.67.0 to 7.67.0 (incl.)
  • affected from 7.66.0 to 7.66.0 (incl.)
  • affected from 7.65.3 to 7.65.3 (incl.)
  • affected from 7.65.2 to 7.65.2 (incl.)
  • affected from 7.65.1 to 7.65.1 (incl.)
  • affected from 7.65.0 to 7.65.0 (incl.)
  • affected from 7.64.1 to 7.64.1 (incl.)
  • affected from 7.64.0 to 7.64.0 (incl.)
  • affected from 7.63.0 to 7.63.0 (incl.)
  • affected from 7.62.0 to 7.62.0 (incl.)
  • affected from 7.61.1 to 7.61.1 (incl.)
  • affected from 7.61.0 to 7.61.0 (incl.)
  • affected from 7.60.0 to 7.60.0 (incl.)
  • affected from 7.59.0 to 7.59.0 (incl.)
  • affected from 7.58.0 to 7.58.0 (incl.)
  • affected from 7.57.0 to 7.57.0 (incl.)
  • affected from 7.56.1 to 7.56.1 (incl.)
  • affected from 7.56.0 to 7.56.0 (incl.)
  • affected from 7.55.1 to 7.55.1 (incl.)
  • affected from 7.55.0 to 7.55.0 (incl.)
  • affected from 7.54.1 to 7.54.1 (incl.)
  • affected from 7.54.0 to 7.54.0 (incl.)
  • affected from 7.53.1 to 7.53.1 (incl.)
  • affected from 7.53.0 to 7.53.0 (incl.)
  • affected from 7.52.1 to 7.52.1 (incl.)
  • affected from 7.52.0 to 7.52.0 (incl.)
  • affected from 7.51.0 to 7.51.0 (incl.)
  • affected from 7.50.3 to 7.50.3 (incl.)
  • affected from 7.50.2 to 7.50.2 (incl.)
  • affected from 7.50.1 to 7.50.1 (incl.)
  • affected from 7.50.0 to 7.50.0 (incl.)
  • affected from 7.49.1 to 7.49.1 (incl.)
  • affected from 7.49.0 to 7.49.0 (incl.)
  • affected from 7.48.0 to 7.48.0 (incl.)
  • affected from 7.47.1 to 7.47.1 (incl.)
  • affected from 7.47.0 to 7.47.0 (incl.)
  • affected from 7.46.0 to 7.46.0 (incl.)

Credits

  • Stanislav Fort (Aisle Research) finder
  • Daniel Stenberg remediation developer

References

Problem Types

  • CWE-201 Information Exposure Through Sent Data