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GHSA-wv64-j4fq-5f9x

MediumCVSS 6.8 / 10
Published Sep 15, 2026·Last modified Sep 15, 2026
Affected Components(5)
Maven logoorg.http4s/http4s-client_2.13
< 0.23.35
Maven logoorg.http4s/http4s-client_2.13
1.0.0-M1 – 1.0.0-M47
Maven logoorg.http4s/http4s-client_3
< 0.23.35
1 / 2
Description

When processing a Set-Cookie from a response, the CookieJar client middleware trusts the server-supplied Domain attribute verbatim, with no check that it domain-matches the host that sent the cookie (RFC6265 §5.3 step 6) and no public suffix check. A malicious or compromised server can therefore plant a cookie for any domain in the cookie jar, which is subsequently set on the client's next request to that victim domain, enabling session fixation or overwriting security-relevant cookies.

Impact

Session fixation and overwrite of security-relevant cookies for arbitrary domains contacted by the same wrapped client.

Preconditions

  • Application uses the CookieJar client middleware.
  • Application contacts an attacker-controlled (or compromised) server using the same jar it uses for trusted hosts.

Workarounds

  • Do not share a CookieJar across trusted and untrusted targets.

Note

This middleware still does not implement public suffix rejection.

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Risk Scores
Base Score
6.8

The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the integrity of the data.

Threat Intelligence
6.2

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.40%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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