CVE-2024-1455

Billion Laughs Attack leading to DoS in langchain-ai/langchain

MEDIUM
5.9
CVSS Score
Published: March 26, 2024 at 02:03 PM UTC
Updated: June 17, 2026 at 07:04 AM UTC
2 products affected across 2 vendorsLangchainLangChain

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Severity
MEDIUM5.9
Exploit prediction
EPSS 0.8%
SSVC
PoC

Description

A vulnerability in the langchain-ai/langchain repository allows for a Billion Laughs Attack, a type of XML External Entity (XXE) exploitation. By nesting multiple layers of entities within an XML document, an attacker can cause the XML parser to consume excessive CPU and memory resources, leading to a denial of service (DoS).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

0.1.4 ≤ v ≤ 0.1.35
v < 0.1.35
Affected range stops below 0.1.35, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-776

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