CVE-2026-67987: n/a
crmne/ruby_llm at commit fa6f279847d6d7027814539d9c0dfc3bbdfd2a83 contains polynomial-time regular expression denial-of-service conditions in think-tag response parsing on Ruby 3.1.x. A malicious or anomalous model response containing many unterminated <think> tags can cause excessive CPU consumption in two consecutive regular expressions and delay chat-completion processing
AI Analysis
Technical Summary
The vulnerability exists in crmne/ruby_llm at commit fa6f279847d6d7027814539d9c0dfc3bbdfd2a83, where two consecutive regular expressions used to parse think-tag responses can exhibit polynomial-time complexity. This allows an attacker to craft a model response containing numerous unterminated <think> tags, triggering excessive CPU consumption and causing delays in chat-completion processing on Ruby 3.1.x environments.
Potential Impact
Exploitation of this vulnerability can lead to denial-of-service conditions by consuming excessive CPU resources, thereby delaying or disrupting chat-completion processing. There is no indication of code execution or data leakage. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider limiting or sanitizing inputs that may contain unterminated <think> tags to reduce the risk of triggering the ReDoS condition.
CVE-2026-67987: n/a
Description
crmne/ruby_llm at commit fa6f279847d6d7027814539d9c0dfc3bbdfd2a83 contains polynomial-time regular expression denial-of-service conditions in think-tag response parsing on Ruby 3.1.x. A malicious or anomalous model response containing many unterminated <think> tags can cause excessive CPU consumption in two consecutive regular expressions and delay chat-completion processing
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability exists in crmne/ruby_llm at commit fa6f279847d6d7027814539d9c0dfc3bbdfd2a83, where two consecutive regular expressions used to parse think-tag responses can exhibit polynomial-time complexity. This allows an attacker to craft a model response containing numerous unterminated <think> tags, triggering excessive CPU consumption and causing delays in chat-completion processing on Ruby 3.1.x environments.
Potential Impact
Exploitation of this vulnerability can lead to denial-of-service conditions by consuming excessive CPU resources, thereby delaying or disrupting chat-completion processing. There is no indication of code execution or data leakage. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider limiting or sanitizing inputs that may contain unterminated <think> tags to reduce the risk of triggering the ReDoS condition.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-07-30T00:00:00.000Z
- State
- PUBLISHED
Threat ID: 6abc1a5e680226ef6837a5a1
Added to database: 09/29/2026, 20:06:54 UTC
Last enriched: 09/29/2026, 20:21:33 UTC
Last updated: 09/30/2026, 03:38:32 UTC
Views: 10
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