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Fencer Intel
medium 6.1

CVE-2026-41715 json

Reactor Netty HTTP Client Leaks Credentials On Protocol Downgrade Redirect

published 5mo ago modified 3mo ago also GHSA-pfc9-2cqg-9wq6 , EUVD-2026-35322

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

Summary

In specific scenarios involving HTTP redirects from a secure to an insecure endpoint, the Reactor Netty HTTP client may leak credentials. In order for this to happen, the HTTP client must have been explicitly configured to follow redirects.

Affected versions: Reactor Netty 1.0.0 through 1.0.51; 1.1.0 through 1.1.35; 1.2.0 through 1.2.17; 1.3.0 through 1.3.5.

Patch / fix

  • maven io.projectreactor.netty:reactor-netty 1.2.18, 1.3.6
  • Spring Reactor Netty 1.0.52, 1.1.36, 1.2.17.1, 1.3.15.1

Is CVE-2026-41715 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-41715 updated cvss 6.5

reactor-netty: Reactor Netty: Credential leakage via HTTP redirects from secure to insecure endpoints

  • Red Hat Fuse 7 reactor-netty
    affected: workaround, no fix planned “Do not configure the Reactor Netty HTTP client to automatically follow redirects, or ensure that redirect following is restricted to same-scheme (HTTPS-to-HTTPS) redirects only.”
  • Red Hat JBoss Enterprise Application Platform Expansion Pack reactor-netty
    affected: workaround, no fix available “Do not configure the Reactor Netty HTTP client to automatically follow redirects, or ensure that redirect following is restricted to same-scheme (HTTPS-to-HTTPS) redirects only.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
5mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
GitHub 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven io.projectreactor.netty:reactor-netty
>=1.3.0, <1.3.6
>=1.2.0, <1.2.18
>=1.1.0, <=1.1.31
>=1.0.0, <=1.0.48
1.3.6
1.2.18

Affected products

  • Spring Reactor Netty

Classification

Weakness
  • CWE-522 Insufficiently Protected Credentials

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.