CVE-2026-93711Network attack vectorHinoki check available

Response splitting via unsanitized header names

Published Sep 22, 2026 · Updated Sep 22, 2026

HTTP response splitting in PerlDancer Dancer2 before 2.2.0 allows remote attackers to inject response headers through crafted header names. The headers_to_array routine strips CR and LF from each header value but passes header names containing those bytes unchanged into the PSGI header array. Exploitation requires an application to derive a response header name from request data and a PSGI server that does not reject the name, allowing attacker-supplied header lines to reach clients.

CVSS severityUnavailable
Unscored
EPSS probability0.37%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

HTTP response splitting in PerlDancer Dancer2 before 2.2.0 allows remote attackers to inject response headers through crafted header names. The headers_to_array routine strips CR and LF from each header value but passes header names containing those bytes unchanged into the PSGI header array. Exploitation requires an application to derive a response header name from request data and a PSGI server that does not reject the name, allowing attacker-supplied header lines to reach clients.

The record

CVE
CVE-2026-93711
Published
Sep 22, 2026
Updated
Sep 22, 2026
Vendor
PerlDancer
Product
Dancer2
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PerlDancer · Dancer2version=0 <2.2.0

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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