How many CVEs have patched _parse_f_string_fields?

1 published CVEs changed _parse_f_string_fields in langchain-ai/langchain, in 4 distinct patches totalling 40 changed lines, between 2026 and 2026.

What is the latest CVE that changed _parse_f_string_fields?

CVE-2026-40087 (LangChain has incomplete f-string validation in prompt templates), published 2026-04-09, changed lines 266 to 305 of libs/core/langchain_core/prompts/string.py.

How does _parse_f_string_fields compare to the rest of langchain-ai/langchain?

langchain-ai/langchain has 30 CVEs with a located fix in total; 1 of them changed _parse_f_string_fields.

What do the line numbers refer to?

Line numbers are in the fixed version of the file, as the upstream patch left it. A CVE whose fix was backported to several branches is listed once, with the lines from the upstream commit.

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_parse_f_string_fields

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Patched Functions
Langchain Ai
Langchain
_parse_f_string_fields

_parse_f_string_fields in langchain-ai/langchain: Patched by 1 CVEs

langchain-ai/langchain

Function

_parse_f_string_fields

Name: _parse_f_string_fields in langchain-ai/langchain: CVE fixes
Creator: RadicalNotion.AI
License: https://creativecommons.org/licenses/by-nc/4.0/

libs/core/langchain_core/prompts/string.py

Last patched April 9, 2026

CVEs

That changed this function

Distinct patches

Backports counted once

Lines changed

Added plus removed

2026

Years

By CVE publication date

Overview

_parse_f_string_fields in langchain-ai/langchain was changed by 1 published CVE fixes in 2026, in 4 distinct patches that added or removed 40 lines in total.

langchain-ai/langchain has 30 CVEs with a located fix in total, so 3% of them touched this function.

CVEs that patched it

Every published CVE whose fix changed _parse_f_string_fields, newest first, with the lines each fix touched.

LangChain has incomplete f-string validation in prompt templates
CVE-2026-40087 · lines 266–305 · +40 −0
Medium · CVSS 5.3
EPSS 0.5%2026-04-09

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Other functions in these files

Functions in the same file that CVE fixes also changed.

1get_template_variableslibs/core/langchain_core/prompts/string.py2 CVEs · 6 patches2025 to 2026
2check_valid_templatelibs/core/langchain_core/prompts/string.py1 CVEs · 4 patches2026
3_get_jinja2_variables_from_templatelibs/core/langchain_core/prompts/string.py1 CVEs · 2 patches2025
4jinja2_formatterlibs/core/langchain_core/prompts/string.py1 CVEs · 2 patches2025

Other hotspots in the repository

Functions in langchain-ai/langchain changed by the most CVE fixes.

validate_code3 CVEs · langchain/chains/pal/base.py from_colored_object_prompt3 CVEs · langchain/chains/pal/base.py run3 CVEs · langchain/utilities/python.py warn_once3 CVEs · langchain/utilities/python.py get_template_variables2 CVEs · libs/core/langchain_core/prompts/string.py __init__2 CVEs · libs/community/langchain_community/retrievers/web_research.py

All patched functions in langchain-ai/langchain

Frequently asked questions

Common questions about CVE fixes to _parse_f_string_fields.

How many CVEs have patched _parse_f_string_fields?: 1 published CVEs changed _parse_f_string_fields in langchain-ai/langchain, in 4 distinct patches totalling 40 changed lines, between 2026 and 2026.
What is the latest CVE that changed _parse_f_string_fields?: CVE-2026-40087 (LangChain has incomplete f-string validation in prompt templates), published 2026-04-09, changed lines 266 to 305 of libs/core/langchain_core/prompts/string.py.
How does _parse_f_string_fields compare to the rest of langchain-ai/langchain?: langchain-ai/langchain has 30 CVEs with a located fix in total; 1 of them changed _parse_f_string_fields.
What do the line numbers refer to?: Line numbers are in the fixed version of the file, as the upstream patch left it. A CVE whose fix was backported to several branches is listed once, with the lines from the upstream commit.

References

libs/core/langchain_core/prompts/string.py on GitHub (opens in a new tab)
All patched functions in langchain-ai/langchain
Patched functions directory

Fix locations are computed by RadicalNotion.AI from the upstream patch diff of each CVE. CVE data is sourced from the CVE Program.

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