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Esp IdfApplication · Espressif

CVE-2026-45542

HIGH · 7.1 CVSS v3.1 Published 2026-06-10
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
76/100
Remediation priority · High
No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.2.6, 5.3.5, 5.4.4, 5.5.4, and 6.0, a heap buffer overflow exists in the Security Scheme 2 (SRP6a) session-setup path of the protocomm component. The first-phase handler (handle_session_command0() in components/protocomm/src/security/security2.c) trusts the length of a client-supplied protobuf field for the SRP6a username and copies it into a buffer whose size is derived from a narrower destination type. The resulting truncation-versus-copy asymmetry corrupts the heap when an oversized value is supplied. This issue has been patched in versions 5.2.7, 5.3.6, 5.4.5, 5.5.5, and 6.0.1.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-122

Data overflows a buffer allocated on the heap, corrupting neighbouring heap structures and allocator metadata that a patient attacker can groom into control of execution. It is subtler than a stack overflow but just as dangerous. The fix is validating lengths before every write and using safe allocators and bounded operations.

General guidance for the heap-based buffer overflow class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Esp IdfApplication
Affected:= 5.2.6= 5.3.5= 5.4.4= 5.5.4= 6.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix High confidence

Upgrade to ESP-IDF 5.2.7, 5.3.6, 5.4.5, 5.5.5, or 6.0.1 (whichever corresponds to your current major.minor branch)

  1. Identify the currently installed ESP-IDF version using 'idf.py --version' or checking the version file
  2. Upgrade to a patched version: For ESP-IDF 5.2.x, upgrade to 5.2.7 or later; For ESP-IDF 5.3.x, upgrade to 5.3.6 or later; For ESP-IDF 5.4.x, upgrade to 5.4.5 or later; For ESP-IDF 5.5.x, upgrade to 5.5.5 or later; For ESP-IDF 6.0.x, upgrade to 6.0.1 or later
  3. To upgrade ESP-IDF, run 'git fetch origin' followed by 'git checkout <target_tag>' (e.g., 'git checkout v5.2.7') in the ESP-IDF installation directory
  4. After upgrading, run 'git submodule update --init --recursive' to update submodules
  5. Verify the upgrade by running 'idf.py --version' to confirm the new version is installed
  6. Rebuild any projects with 'idf.py fullclean' followed by 'idf.py build' to ensure the fixed components are used

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-45542 in production — separate from our analysis above.

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What this is

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