VulnerabilityPublished 20 Oct 2026Updated 3 Nov 2026

CVE-2026-19953: perl:5.32 security update

Affects perlSource GCVE Database

Authoritative record:CVE-2026-19953· Medium 6.5

Not known to be exploited · CVSS 6.5 Medium · fixed in 4:5.32.1-475.module_el8.10.0+4278+b5f6cf5f : update perl when convenient.

Data as of 3 Nov 2026, 15:31 UTC

CVSS 3.1 base score

6.5Medium

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

Patch: Available – fixed in 4:5.32.1-475.module_el8.10.0+4278+b5f6cf5f, 1.1903-10.module_el8.6.0+2766+8bf0b7ce, 2.38-5.module_el8.10.0+4240+a58b978c +204

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: Low
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: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on 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 31 Aug 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 3 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.

almalinux-8

What to do

Upgrade to a fixed release listed under Affected software.

Patches and advisories

access.redhat.com/errata/RHSA-2026:85917 (opens in a new tab)

Affected software

Product	Affected	Fixed in
AlmaLinux 8perl	Affected <4:5.32.1-475.module_el8.10.0+4278+b5f6cf5f	Fixed in 4:5.32.1-475.module_el8.10.0+4278+b5f6cf5f
AlmaLinux 8perl-Algorithm-Diff	Affected <1.1903-10.module_el8.6.0+2766+8bf0b7ce	Fixed in 1.1903-10.module_el8.6.0+2766+8bf0b7ce
AlmaLinux 8perl-Archive-Tar	Affected <2.38-5.module_el8.10.0+4240+a58b978c	Fixed in 2.38-5.module_el8.10.0+4240+a58b978c
AlmaLinux 8perl-Archive-Zip	Affected <1.68-3.module_el8.6.0+2766+8bf0b7ce	Fixed in 1.68-3.module_el8.6.0+2766+8bf0b7ce
AlmaLinux 8perl-Attribute-Handlers	Affected <1.01-475.module_el8.10.0+4278+b5f6cf5f	Fixed in 1.01-475.module_el8.10.0+4278+b5f6cf5f
AlmaLinux 8perl-AutoLoader	Affected <5.74-475.module_el8.10.0+4278+b5f6cf5f	Fixed in 5.74-475.module_el8.10.0+4278+b5f6cf5f

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

AI-suggested

A security update is available and should be applied to affected Perl packages. The fixed versions are listed in the advisory and include perl-5.32.1-475.module_el8.10.0+4278+b5f6cf5f and related module updates. Users should follow the vendor's update instructions to remediate the vulnerability. No additional mitigation steps are indicated beyond applying the official patch.

Description

A moderate severity security vulnerability (CVE-2026-19953) affects Perl, a widely used high-level programming language. The issue is a security bypass in the URI module caused by incorrect hostname encoding due to missing Unicode normalization. This flaw could allow bypassing security checks related to hostname processing. A fix has been released and is available in updated Perl packages for Red Hat Enterprise Linux 8. Users are advised to apply the update to remediate the vulnerability.

Impact

The vulnerability allows a security bypass via incorrect hostname encoding in the URI module of Perl. This could potentially be exploited to circumvent security controls relying on hostname validation. The Red Hat advisory classifies the impact as Moderate. There are no known exploits in the wild at this time.

Summary

CVE-2026-19953 is a security bypass vulnerability in the Perl URI module resulting from improper hostname encoding caused by missing Unicode normalization. This flaw allows security bypass scenarios related to URI hostname processing. The vulnerability affects multiple Perl package versions distributed with Red Hat Enterprise Linux 8. The vendor has issued patches that correct the hostname encoding to include proper Unicode normalization, thereby fixing the security bypass. The advisory rates the impact as Moderate and provides updated package versions to remediate the issue.

References

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