VulnerabilityPublished 4 Nov 2026

CVE-2026-116695: rubygem-crass security update

Affects rubygem-crassSource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-116695· Medium 5.3

Not known to be exploited · CVSS 5.3 Medium : upgrade to 1.0.8-1.oe2403sp3 when convenient.

Data as of 4 Nov 2026, 16:47 UTC

CVSS 4.0 base score

5.3Medium

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

Thin evidence

One scorer or none

CVSS scores by source
CNA (GitHub_M)	CVSS 4.0	5.3

Patch: Available – fixed in 1.0.8-1.oe2403sp3

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: None
User Interaction: Passive
Vulnerable system confidentiality: None
Vulnerable system integrity: None
Vulnerable system availability: None
Subsequent system confidentiality: Low
Subsequent system integrity: Low
Subsequent system availability: None

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

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, 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: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction: Passive: Successful exploitation of this vulnerability requires limited interaction by the targeted user with the vulnerable system and the attacker’s payload. These interactions would be considered involuntary and do not require that the user actively subvert protections built into the vulnerable system.
Vulnerable system confidentiality: None: There is no loss of confidentiality within the Vulnerable System.
Vulnerable system integrity: None: There is no loss of integrity within the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system 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 Subsequent System.
Subsequent system 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 to the Subsequent System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 27 Oct 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 4 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

Upgrade rubygem-crass to 1.0.8-1.oe2403sp3.

Affected software

Product	Affected	Fixed in
openEuler 24.03-LTS-SP3rubygem-crass`pkg:rpm/openEuler/rubygem-crass&distro=openEuler-24.03-LTS-SP3`Other threats	Affected <1.0.8-1.oe2403sp3	Fixed in 1.0.8-1.oe2403sp3

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

AI-suggested

Upgrade rubygem-crass to version 1.0.8 or later, which includes fixes for all described vulnerabilities. The vendor has released official fixes in versions 1.0.7 and 1.0.8 addressing these issues. No additional mitigation is required once the update is applied.

Description

Crass is a Ruby CSS parser compliant with the CSS Syntax Level 3 specification. Multiple vulnerabilities affect versions prior to 1.0.8, including improper handling of escaped characters in URLs that may allow CSS-based UI redress or data exfiltration, recursive parsing without depth limits causing stack overflow or excessive memory use, excessive recursion triggered by many adjacent comments leading to denial of service, and inefficient parsing of non-ASCII characters causing high CPU usage and potential denial of service. These issues are fixed in versions 1.0.7 and 1.0.8.

Impact

An attacker can exploit these vulnerabilities to cause denial of service via excessive recursion or CPU consumption, and potentially perform UI redress or CSS-based data exfiltration through malformed CSS URLs. There is no impact on script execution in modern browsers. The denial of service impacts the availability of applications parsing untrusted CSS with affected versions of Crass.

Summary

The rubygem-crass library has several security vulnerabilities in versions before 1.0.8. CVE-2026-116695 describes improper handling of closing parentheses after escaped backslashes in bad URLs, which can cause the parser to retain CSS declarations that browsers treat as live CSS, potentially enabling UI redress or CSS-based data exfiltration, though it does not allow script execution. CVE-2026-61846 and CVE-2026-61847 describe recursive parsing issues leading to SystemStackError or denial of service due to deeply nested blocks/functions or many adjacent comments, respectively. CVE-2026-61848 describes inefficiencies in parsing non-ASCII characters causing superlinear CPU consumption and potential denial of service. These vulnerabilities have been fixed in versions 1.0.7 and 1.0.8.

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What to do

Affected software

Description

AI analysisMachine-generated, updated 4 Nov 2026, 16:47 UTC

Technical details

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