Riskcovery

CVE-2026-86409

stale SigV4 headers sent unintended

State
Published
Severity
8.1 High
Published
Oct 20, 2026
Updated
Oct 29, 2026
Reserved
Sep 7, 2026

Read the record on cve.org

Description

Setting `CURLOPT_AWS_SIGV4` to NULL but does not disable SigV4 authentication, contrary to expectations and documentation. A subsequent transfer on the same handle still sends an `Authorization: AWS4-HMAC-SHA256` header to whatever URL isset next, leaking state information.

Scores

CVSSScoreVectorSource
3.18.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HCISA-ADP

Weaknesses

  • CWE-201 Insertion of Sensitive Information Into Sent Data

Affected Products

ProductVersions
curlcurl
  • 8.21.0 through 8.21.0Affected
  • 8.20.0 through 8.20.0Affected
  • 8.19.0 through 8.19.0Affected
  • 8.18.0 through 8.18.0Affected
  • 8.17.0 through 8.17.0Affected
  • 8.16.0 through 8.16.0Affected
  • 8.15.0 through 8.15.0Affected
  • 8.14.1 through 8.14.1Affected
  • 8.14.0 through 8.14.0Affected
  • 8.13.0 through 8.13.0Affected
  • 8.12.1 through 8.12.1Affected
  • 8.12.0 through 8.12.0Affected
  • 8.11.1 through 8.11.1Affected
  • 8.11.0 through 8.11.0Affected
  • 8.10.1 through 8.10.1Affected
  • 8.10.0 through 8.10.0Affected
  • 8.9.1 through 8.9.1Affected
  • 8.9.0 through 8.9.0Affected
  • 8.8.0 through 8.8.0Affected
  • 8.7.1 through 8.7.1Affected
  • 8.7.0 through 8.7.0Affected
  • 8.6.0 through 8.6.0Affected
  • 8.5.0 through 8.5.0Affected
  • 8.4.0 through 8.4.0Affected
  • 8.3.0 through 8.3.0Affected
  • and 25 more versions

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.