Is CVE-2026-115693 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-115693 being exploited in the wild.

How severe is CVE-2026-115693?

Informational severity, published 26 October 2026.

Which products and versions are affected?

Benoitc Hackney 1.24.0 to 4.8.x.

Is there a fix for CVE-2026-115693?

Yes: fixed in hackney 4.9.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-115693 attacked?

It is attacked over the network or from the adjacent network, in a software library.

Am I affected by CVE-2026-115693?

Check whether you run Benoitc Hackney at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-115693: Erlang hackney improper certificate validation in SSL pinning

CVE-2026-115693 · Severity: info · Published 2026-10-26

hackney is an HTTP client library used in Erlang applications to securely connect to remote servers. A vulnerability in its certificate pinning mechanism allows an attacker on the network path to impersonate a pinned server by presenting a certificate chain rooted in a publicly trusted certificate authority, bypassing the intended private CA restriction. An attacker would need a valid certificate for the target hostname to exploit this.

Technologies: Benoitc Hackney. Vendors: Benoitc.

Quick answers

Is CVE-2026-115693 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-115693 being exploited in the wild.
How severe is CVE-2026-115693?: Informational severity, published 26 October 2026.
Which products and versions are affected?: Benoitc Hackney 1.24.0 to 4.8.x.
Is there a fix for CVE-2026-115693?: Yes: fixed in hackney 4.9.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-115693 attacked?: It is attacked over the network or from the adjacent network, in a software library.
Am I affected by CVE-2026-115693?: Check whether you run Benoitc Hackney at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: hackney 4.9.0

Technical details

The vulnerability exists in hackney_ssl:merge_ssl_opts/3, which preserves a partial_chain callback that overrides custom certificate store settings (cacerts/cacertfile). This callback accepts any certificate chain containing a publicly trusted root, even when the connection was configured to trust only a specific private CA. The hostname verification is still enforced, requiring a valid public certificate for the target domain.

Affected products

benoitc hackney 1.24.0 to 4.8.x

Timeline

2026-10-26: disclosed: Vulnerability publicly disclosed

References

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