VulnerabilityPublished 4 Nov 2026Updated 12 Nov 2026

CVE-2026-120644: Libcgi pm perl · CGI::Cookie versions before 5.00 for Perl allow cookie attribute injection via

Affects libcgi-pm-perlSource GCVE Database

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Authoritative record:CVE-2026-120644· Critical 9.1

Not known to be exploited · CVSS 9.1 Critical.

Data as of 12 Nov 2026, 21:02 UTC

CVSS 3.1 base score

9.1Critical

How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none

CVSS scores by source
CISA-ADP	CVSS 3.1	9.1

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 3 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 12 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Ubuntu 26.10libcgi-pm-perl`pkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=stonking`Other threats	Affected =4.71-1build1 =4.72-1	Fixed in–
Ubuntu 26.04 LTSlibcgi-pm-perl`pkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=resolute`Other threats	Affected =4.68-1 =4.71-1 =4.71-1build1	Fixed in–
Ubuntu 24.04 LTSlibcgi-pm-perl`pkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=noble`Other threats	Affected 4.57-1 – 4.63-1 5 affected builds	Fixed in–
Ubuntu 22.04 LTSlibcgi-pm-perl`pkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=jammy`Other threats	Affected =4.51-1 =4.53-1 =4.54-1	Fixed in–
Ubuntu 20.04 LTSlibcgi-pm-perl`pkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=focal`Other threats	Affected =4.44-1 =4.45-1 =4.46-1	Fixed in–
Ubuntu 18.04 LTSlibcgi-pm-perl`pkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=bionic`Other threats	Affected =4.36-1 =4.37-1 =4.38-1	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Until a fix is available, avoid setting cookie path, domain, or expires values directly from untrusted input or sanitize these values to prevent injection of semicolons or control characters.

Description

CGI::Cookie versions before 5.00 for Perl contain a vulnerability that allows cookie attribute injection via unvalidated path, domain, and expires values. These values are included in the Set-Cookie header without sanitization, enabling an attacker to inject additional cookie attributes such as Domain or SameSite. This flaw affects multiple specific versions of libcgi-pm-perl and has a critical severity rating with a CVSS score of 9.1.

Impact

Successful exploitation allows an attacker to inject arbitrary cookie attributes via manipulated path, domain, or expires values. This can lead to unauthorized cookie manipulation, potentially bypassing security controls such as SameSite or domain restrictions, thereby compromising user session integrity and confidentiality. The vulnerability does not impact availability.

Summary

The vulnerability in CGI::Cookie versions prior to 5.00 arises because the path, domain, and expires values are written into the Set-Cookie header without validation for semicolons or control characters. If an application sets these values from untrusted request data, an attacker can inject additional cookie attributes, potentially manipulating cookie behavior or security settings. This issue affects numerous specific versions of libcgi-pm-perl as listed and has been assigned CVE-2026-120644 with a CVSS 3.1 score of 9.1, indicating critical impact on confidentiality and integrity.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Nov 2026, 21:02 UTC

Technical details

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