CVE-2026-40087

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.26% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 17.9% of scored records. A rank, not a probability.

NVD base score

5.3 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-04-09 19:34Z4 MO AGO

Last updated

2026-04-14 14:48Z4 MO AGO

Reserved

2026-04-09

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 5.3)

CNA CVSS vector

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

Weaknesses

• CWE-1336Improper Neutralization of Special Elements Used in a Template EngineBase

Data version

5.2

Document digest

e36342cbc1646af689113e397a6b217c257019f8603b415ced3c05ec521bc342

• github.comhttps://github.com/langchain-ai/langchain/security/advisories/GHSA-926x-3r5x-gfhwx_refsource_CONFIRM
• github.comhttps://github.com/langchain-ai/langchain/pull/36612x_refsource_MISC
• github.comhttps://github.com/langchain-ai/langchain/pull/36613x_refsource_MISC
• github.comhttps://github.com/langchain-ai/langchain/commit/6bab0ba3c12328008ddca3e0d54ff5a6151cd27bx_refsource_MISC
• github.comhttps://github.com/langchain-ai/langchain/commit/af2ed47c6f008cdd551f3c0d87db3774c8dfe258x_refsource_MISC
• github.comhttps://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D0.3.84x_refsource_MISC
• github.comhttps://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.2.28x_refsource_MISC