Is there a public exploit for CVE-2026-126350?

No public exploit for CVE-2026-126350 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-126350?

CVE-2026-126350 scores CVSS 5.9 (v3.1), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.0042%.

What does CVE-2026-126350 affect?

CVE-2026-126350 affects addressable.

5.9 Medium

Addressable: Regular Expression Denial of Service in templates with certain exploded expressions

CVE-2026-126350

Impact Within the URI template implementation in Addressable, templates using the (explode) modifier with the /, ., ;, ? or & operators (e.g., {/segments}, {.ext}, {;params}, {?query}) generate regular expressions vulnerable to catastrophic backtracking. When Template#match or Template#extract is called with a maliciously crafted URI that starts with the operator's leading character, matching takes exponential time, leading to uncontrolled resource consumption and denial of service. An input under 60 bytes is enough to occupy a thread for minutes. GHSA-h27x-rffw-24p4 (CVE-2026-35611) reported this pattern as fully remediated in 2.9.0. The 2.9.0 fix only made the joiner between exploded members mandatory for templates without an operator, and its regression specs used inputs that never start with the operator's leading character, so the vulnerable part of the expression was never reached. This issue was originally reported in #364 by @ebenoist in 2019 but insufficiently investigated. Users of the URI parsing capabilities in Addressable but not the URI template matching capabilities are unaffected. Users who only call Template#expand are unaffected. Affected Versions This…

Assessment

CVSS: 5.9 (v3.1)
Severity: Medium
EPSS: 0.0042% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 12 November 2026
Last updated: 12 November 2026
Affected: addressable
Weakness: CWE-1333

CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

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