7.4

CVE-2026-9697: undici vulnerable to TLS certificate validation bypass via dropped requestTls in SOCKS5 ProxyAgent

Modified
AliasesUBUNTU-CVE-2026-9697DEBIAN-CVE-2026-9697CGA-3qhj-r64q-v4rw
Published 17-06-2026Last modified 10-09-2026

Vulnerability summary

CVE-2026-9697 is a high (CVSS 7.4) Improper Certificate Validation vulnerability in nodejs undici. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 39.8% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.4 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.4/10
010
High · v3.1 (CVE.org)
EPSS score
0.46%
0%100%
Low · -0.09 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 7 · Related 1
RHSA-2026:22380RHSA-2026:22934RHSA-2026:35841RHSA-2026:35891RHSA-2026:38236RHSA-2026:39868

Timeline

  1. 17-06-2026
    PublishedVulnerability first disclosed.
  2. 10-09-2026
    Last modifiedVulnerability information updated.

Description

Impact: undici's ProxyAgent silently drops the requestTls option when configured with a SOCKS5 proxy URI (socks5:// or socks://). The target HTTPS connection through the SOCKS5 tunnel falls back to Node's default trust store, ignoring user-configured ca, cert, key, rejectUnauthorized, and servername settings. Applications that pin to an internal or corporate CA via requestTls.ca will, when their proxy URI is SOCKS5, get the default Mozilla CA bundle as the trust anchor instead. Any cert signed by any publicly-trusted CA for the target hostname is accepted, breaking the intended pin and enabling MITM read and tamper of the HTTPS exchange. Affected applications are those that use undici's ProxyAgent (or Socks5ProxyAgent directly) with SOCKS5 AND rely on requestTls for TLS scope restriction. The bug was introduced in undici 7.23.0 when SOCKS5 support was added. Patches: Upgrade to undici v7.28.0 or v8.5.0. Workarounds: No workaround is available within the SOCKS5 path. If a SOCKS5 proxy with TLS scope restriction is required and an upgrade is not yet possible, route the traffic through an HTTP-proxy ProxyAgent instead, where requestTls is honored correctly.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.46%

Chance of exploitation in the next 30 days

Percentile

40%

Versus all other CVEs

30-day change

Decrease -0.09 pp

From 0.55% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard28 products
  • code-server< 4.125.0-r2
  • commercial-gitlab-rails-ee-19.1< 19.1.7-r3
  • commercial-gitlab-rails-ee-19.2< 19.2.7-r1
  • commercial-gitlab-rails-ee-19.3< 19.3.3-r1
  • commercial-gitlab-rails-ee-fips-19.1All versions (No fix recorded) | < 19.1.9-r0
Wolfi7 products
  • code-server< 4.125.0-r2
  • langfuse-3< 3.194.0-r0
  • langfuse-3-compat< 3.225.7-r6
  • langfuse-3-worker< 3.194.0-r0
  • renovate< 43.247.0-r0
Debian1 product
  • node-undiciAll versions (No fix recorded) | < 8.5.0+dfsg+~cs3.2.0-1
Nodejs1 product
  • undici≥ 7.23.0, < 7.28.0 | ≥ 8.0.0, < 8.5.0
Npm1 product
  • undici≥ 7.23.0, < 7.28.0 | ≥ 8.0.0, < 8.5.0
Ubuntu1 product
  • node-undiciAll versions (No fix recorded)
Undici1 product
  • undici≥ 7.23.0, < 7.28.0 | ≥ 8.0.0, < 8.5.0

7 vendors · 40 products

References

31 links
Show all 31 references