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Low 30 Cryptographic libraries

blockchain_db: fix remove_block * remove_block should set the cursor before deletion

Public commit record

What the developer wrote

Authored by 0xFFFC0000

65/100 · Adequate
blockchain_db: fix remove_block
* remove_block should set the cursor before deletion
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Provides an explanatory body
The short version

What changed, and why it matters

This commit is titled as a fix for the blockchain database's 'remove_block' function, specifically that the cursor should be set before deletion. However, the actual supplied diff is enormous (665,233 added lines across 1,321 files) and appears to be a full repository import or merge rather than a focused patch. The specific code change described in the title cannot be verified from the provided diff because the relevant file (src/blockchain_db/lmdb/db_lmdb.cpp) is not shown in the diff excerpt. The security relevance is therefore uncertain based only on the materials given.

Recommended action

Obtain the actual focused diff for src/blockchain_db/lmdb/db_lmdb.cpp and related blockchain_db files to verify the remove_block cursor fix. Run the blockchain_db unit tests and any chain reorganization tests. If the bug is confirmed, assess whether it can cause database corruption or consensus issues during chain reorganizations, and consider a security advisory if network integrity is at risk.

Security signals we found

01

Commit title references a database cursor fix in remove_block

02

Potential use-after-free or cursor invalidation bug in LMDB block removal

03

Massive diff size inconsistent with a single focused security fix

04

Relevant source file (src/blockchain_db/lmdb/db_lmdb.cpp) not present in supplied diff

Risk score

Why this scored 30/100

Our methodology →
Potential impact 8/30
Exploitability 4/25
Stealth signal 5/15
Affected reach 6/15
Confidence 5/10
Evidence quality 2/5
Human-validated context

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