CVE-2026-8286VulnerabilityPublished 20 Aug 2026Updated 30 Oct 2026

Red Hat Security Advisory: curl security, bug fix, and enhancement update

Affects Red Hat curl security,Source GCVE Database

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Not known to be exploited.

Data as of 30 Oct 2026, 11:52 UTC

Severity

High

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.3% chance of exploitation in 30 days – higher than 23% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
CVE published 20 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

AI-suggested

Red Hat has released an official update for curl in Red Hat Enterprise Linux 8 and its extended life cycle versions that addresses the TLS configuration mismatch vulnerability and fixes the NTLM regression. Users should apply this update promptly following Red Hat's published guidance at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated beyond applying the official patch.

Description

A security update for the curl utility and libcurl library addresses an insecure connection establishment vulnerability due to a TLS configuration mismatch (CVE-2026-8286). This flaw could allow improper TLS connections, potentially undermining secure communications. The update also fixes a regression affecting NTLM authentication over HTTP/1.1. The vulnerability is rated as having a high security impact by Red Hat. The advisory applies to Red Hat Enterprise Linux 8 and its extended life cycle versions across multiple architectures. Users are advised to apply the provided update to remediate the issue.

Impact

The vulnerability allows insecure TLS connections due to configuration mismatches, which can compromise the security guarantees of TLS in curl-based communications. This may expose sensitive data or allow interception by attackers. The NTLM regression fix restores proper authentication protocol usage, preventing potential authentication failures or security bypasses. The overall security impact is rated as high by Red Hat.

Summary

The curl packages in Red Hat Enterprise Linux 8 were found to have a security vulnerability (CVE-2026-8286) involving insecure connection establishment caused by a TLS configuration mismatch. This could lead to connections that do not properly enforce TLS security, potentially exposing data or allowing man-in-the-middle attacks. Additionally, a regression introduced in a prior update broke the logic forcing NTLM authentication to use HTTP/1.1, which has been corrected. Red Hat has issued an update to fix these issues, rated as Important in severity. The advisory references Red Hat's errata RHSA-2026:57462 and provides updated package versions for multiple architectures. No public exploit or CVSS score is currently available.

CWE-295Improper Certificate Validation (opens in a new tab)
Base weaknessOWASP Top 10 A07:2025: Authentication Failures (opens in a new tab)
The product does not validate, or incorrectly validates, a certificate.
Architecture and Design · Implementation
Certificates should be carefully managed and checked to assure that data are encrypted with the intended owner's public key.
Implementation
If certificate pinning is being used, ensure that all relevant properties of the certificate are fully validated before the certificate is pinned, including the hostname.
OWASP Cheat Sheets
Transport Layer Protection (opens in a new tab)
TLS Cipher String (opens in a new tab)
OWASP Authentication (opens in a new tab)
OWASP ASVS 4.0.3
V9.2.1 (opens in a new tab)
V1.9.2 (opens in a new tab)
V2.8.5 (opens in a new tab)
Attack patterns
Creating a Rogue Certification Authority Certificate (opens in a new tab)
Signature Spoofing by Improper Validation (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 30 Oct 2026, 09:44 UTC

WeaknessesCWE-295

Technical details

References

Community reviews

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