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VulnerabilityPublished

CVE-2026-87862: curl · Insertion of Sensitive Information Into Sent Data

Affects curlSource CVE Database V5

0

Not known to be exploited.

Data as of 26 Oct 2026, 17:30 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.

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
  • >=8.22.0 <=8.22.0
  • >=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
Fixed in–

Description

Importing a `includeSubDomains` parent HSTS entry before a longer-lived child entry, silently drops the child. Consequently, when the parent expires, the child's valid HSTS policy is lost, causing curl to issue unencrypted HTTP requests rather than upgrading to HTTPS.

References

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