8.2

CVE-2026-82209: curl

CVSS: 8.2v3.1HighModified
AliasesALPINE-CVE-2026-82209UBUNTU-CVE-2026-82209DEBIAN-CVE-2026-82209
Published 06-09-2026Last modified 15-09-2026
Open JSON

Vulnerability summary

CVE-2026-82209 is a high (CVSS 8.2) vulnerability in curl. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 30% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
43/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.2/10
010
High · v3.1 (CVE.org)
EPSS score
0.37%
0%100%
Low · -0.17 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 4 · Related 2
MGASA-2026-0515OPENSUSE-SU-2026:11696-1RHSA-2026:63161USN-8820-1

Timeline

  1. 06-09-2026
    PublishedVulnerability first disclosed.
  2. 15-09-2026
    Last modifiedVulnerability information updated.

Description

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`).

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.37%

Chance of exploitation in the next 30 days

Percentile

30%

Versus all other CVEs

30-day change

-0.17 pp

From 0.54% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.37%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (hackerone.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Chainguard17 products
  • curl< 8.22.0-r2
  • curl-dev< 8.22.0-r2
  • curl-doc< 8.22.0-r2
  • curl-oci-entrypoint< 8.22.0-r2
  • curl-static< 8.22.0-r2
Wolfi7 products
  • curl< 8.22.0-r2
  • curl-dev< 8.22.0-r2
  • curl-doc< 8.22.0-r2
  • curl-oci-entrypoint< 8.22.0-r2
  • curl-static< 8.22.0-r2
Alpine1 product
  • curl≥ 7.46.0, < 8.22.0-r0
Curl1 product
  • curl≥ 7.46.0, < 8.14.2 | ≥ 8.15.0, < 8.16.1 | ≥ 8.17.0, < 8.20.1 | ≥ 8.21.0, < 8.22.0 | ≥ e77b5b7453c1e8ccd7ec0816890d98e2f392e465, < 95c1e8915dce64606bd753fd47fc0bd236e31cd6 | 8.21.0 | 8.20.0 | 8.19.0 | 8.18.0 | 8.17.0 | 8.16.0 | 8.15.0 | 8.14.1 | 8.14.0 | 8.13.0 | 8.12.1 | 8.12.0 | 8.11.1 | 8.11.0 | 8.10.1 | 8.10.0 | 8.9.1 | 8.9.0 | 8.8.0 | 8.7.1 | 8.7.0 | 8.6.0 | 8.5.0 | 8.4.0 | 8.3.0 | 8.2.1 | 8.2.0 | 8.1.2 | 8.1.1 | 8.1.0 | 8.0.1 | 8.0.0 | 7.88.1 | 7.88.0 | 7.87.0 | 7.86.0 | 7.85.0 | 7.84.0 | 7.83.1 | 7.83.0 | 7.82.0 | 7.81.0 | 7.80.0 | 7.79.1 | 7.79.0 | 7.78.0 | 7.77.0 | 7.76.1 | 7.76.0 | 7.75.0 | 7.74.0 | 7.73.0 | 7.72.0 | 7.71.1 | 7.71.0 | 7.70.0 | 7.69.1 | 7.69.0 | 7.68.0 | 7.67.0 | 7.66.0 | 7.65.3 | 7.65.2 | 7.65.1 | 7.65.0 | 7.64.1 | 7.64.0 | 7.63.0 | 7.62.0 | 7.61.1 | 7.61.0 | 7.60.0 | 7.59.0 | 7.58.0 | 7.57.0 | 7.56.1 | 7.56.0 | 7.55.1 | 7.55.0 | 7.54.1 | 7.54.0 | 7.53.1 | 7.53.0 | 7.52.1 | 7.52.0 | 7.51.0 | 7.50.3 | 7.50.2 | 7.50.1 | 7.50.0 | 7.49.1 | 7.49.0 | 7.48.0 | 7.47.1 | 7.47.0 | 7.46.0
Debian1 product
  • curlAll versions (No fix recorded) | < 8.22.0-1
Haxx1 product
  • curl≥ 7.46.0, < 8.22.0
Ubuntu1 product
  • curl< 7.58.0-2ubuntu3.24+esm14 | < 7.68.0-1ubuntu2.25+esm9 | < 7.81.0-1ubuntu1.29 | < 8.5.0-2ubuntu10.15 | < 8.20.0-2ubuntu11 | < 8.18.0-1ubuntu2.7

7 vendors · 29 products

References

11 links
Show all 11 references