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VulnerabilityPublished

CVE-2026-86409: curl · Insertion of Sensitive Information Into Sent Data

Affects curlSource CVE Database V5

0

Not known to be exploited · patch available : update curl when convenient.

Data as of 26 Oct 2026, 13:07 UTC

Severity
Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS
0.2% chance of exploitation in 30 days – higher than 17% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 20 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
curlcurlAffected
  • >=8.21.0 <=8.21.0
  • >=8.20.0 <=8.20.0
  • >=8.19.0 <=8.19.0
  • >=8.18.0 <=8.18.0
  • >=8.17.0 <=8.17.0
  • >=8.16.0 <=8.16.0
  • >=8.15.0 <=8.15.0
  • >=8.14.1 <=8.14.1
  • >=8.14.0 <=8.14.0
  • >=8.13.0 <=8.13.0
  • >=8.12.1 <=8.12.1
  • >=8.12.0 <=8.12.0
  • >=8.11.1 <=8.11.1
  • >=8.11.0 <=8.11.0
  • >=8.10.1 <=8.10.1
  • >=8.10.0 <=8.10.0
  • >=8.9.1 <=8.9.1
  • >=8.9.0 <=8.9.0
  • >=8.8.0 <=8.8.0
  • >=8.7.1 <=8.7.1
  • >=8.7.0 <=8.7.0
  • >=8.6.0 <=8.6.0
  • >=8.5.0 <=8.5.0
  • >=8.4.0 <=8.4.0
  • >=8.3.0 <=8.3.0
  • >=8.2.1 <=8.2.1
  • >=8.2.0 <=8.2.0
  • >=8.1.2 <=8.1.2
  • >=8.1.1 <=8.1.1
  • >=8.1.0 <=8.1.0
  • >=8.0.1 <=8.0.1
  • >=8.0.0 <=8.0.0
  • >=7.88.1 <=7.88.1
  • >=7.88.0 <=7.88.0
  • >=7.87.0 <=7.87.0
  • >=7.86.0 <=7.86.0
  • >=7.85.0 <=7.85.0
  • >=7.84.0 <=7.84.0
  • >=7.83.1 <=7.83.1
  • >=7.83.0 <=7.83.0
  • >=7.82.0 <=7.82.0
  • >=7.81.0 <=7.81.0
  • >=7.80.0 <=7.80.0
  • >=7.79.1 <=7.79.1
  • >=7.79.0 <=7.79.0
  • >=7.78.0 <=7.78.0
  • >=7.77.0 <=7.77.0
  • >=7.76.1 <=7.76.1
  • >=7.76.0 <=7.76.0
  • >=7.75.0 <=7.75.0
Fixed in–

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.

References

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