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CVE-2026-34070Proof of concept (PoC) published · CISASuited to automated attack · CISA

LangChain Core has Path Traversal vulnerabilites in legacy `load_prompt` functions

CVSS score

7.5

EPSS probability

%1.2

Risk score

0.1

Published

6 mo ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Official patch verified

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Vulnerability description

DayBreach CVE AI Research

CVE-2026-34070 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

LangChain is a framework for building agents and LLM-powered applications. Prior to version 1.2.22, multiple functions in langchain_core.prompts.loading read files from paths embedded in deserialized config dicts without validating against directory traversal or absolute path injection. When an application passes user-influenced prompt configurations to load_prompt() or load_prompt_from_config(), an attacker can read arbitrary files on the host filesystem, constrained only by file-extension checks (.txt for templates, .json/.yaml for examples). This issue has been patched in version 1.2.22.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-34070 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1langchain-ailangchain View
2langchainlangchain core View
Total affected vendors: 2|Products: 2

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
7.5CVSS V31HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NNVD
7.5CVSS V3_1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NCVE CNA
7.5CVSS V3_1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NCVE ADP

Patch and Remediation Guide

Solution & Remediation Advisory

Patch verified

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nvd

NVD tarafından Patch olarak etiketlenmiş referans

Open source
Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Apply the official update named in the evidence only to the matching product and version.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-34070 is associated with the following CWEs:

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-34070 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden
PermissionsGerekmiyor
UserGerekmiyor

Official Sources and Advisories

https://github.com/langchain-ai/langchain/security/advisories/GHSA-qh6h-p6c9-ff54vendor-advisoryhttps://github.com/langchain-ai/langchain/commit/27add913474e01e33bededf4096151130ba0d47cvendor-advisoryhttps://github.com/langchain-ai/langchain/releases/tag/langchain-core==1.2.22vendor-advisoryhttps://access.redhat.com/errata/RHSA-2026:24766nvdhttps://access.redhat.com/errata/RHSA-2026:37275nvdhttps://access.redhat.com/errata/RHSA-2026:59159nvdhttps://access.redhat.com/security/cve/CVE-2026-34070nvdhttps://bugzilla.redhat.com/show_bug.cgi?id=2453287nvdhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34070.jsonnvd

CVSS Vector Radar Chart

7.5 / 10
Attack VectorNetworkComplexityLowPrivilegesNoneUser Interact.NoneConfidentialityLowIntegrityNoneAvailabilityNone

Vulnerability Scoring Details

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone required
User InteractionNone required
Confidentiality (Gizlilik)Low
Integrity (Bütünlük)None
Availability (Erişilebilirlik)None

Yama doğrulandı

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Weakness Type (CWE & CAPEC)

CWE-22

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CVE-2026-34070 · LangChain Core has Path Traversal vulnerabilites in legacy `load_prompt` functions · DayBreach