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🛡️ CVE-2022-23507 — tendermint-light-client

🟡 CVSS 5.4 — Medium ✅ No Known Exploit CWE-347 OSV
5.4
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Tendermint light client verification not taking into account chain ID

Impact

Anyone using the tendermint-light-client and related packages to perform light client verification (e.g. IBC-rs, Hermes).

At present, the light client does not check that the chain IDs of the trusted and untrusted headers match, resulting in a possible attack vector where someone who finds a header from an untrusted chain that satisfies all other verification conditions (e.g. enough overlapping validator signatures) could fool a light client.

The attack vector is currently theoretical, and no proof-of-concept exists yet to exploit it on live networks.

Patches

Users of the light client-related crates can currently upgrade to v0.28.0.

Workarounds

None

References

  • [Light Client specification](https://github.com/tendermint/tendermint/tree/main/spec/light-client)

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality low, integrity low, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Changed — a successful attack reaches components beyond the vulnerable one.
  • Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
  • Integrity impact: Low — limited, and the attacker does not choose what is affected.
  • Availability impact: None.

Weakness class

CVE-2022-23507 is classified as CWE-347: Improper Verification of Cryptographic Signature. A signature is not checked correctly, so forged or modified content is accepted as genuine.

Affected software

CVE-2022-23507 is recorded against 3 packages.

  • tendermint-light-client
  • tendermint-light-client-js
  • tendermint-light-client-verifier

Timeline and source

Published on 14 December 2022 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)

Same weakness in other software

These advisories are the same class of weakness (CWE-347: Improper Verification of Cryptographic Signature) in other software:

Details

Severity MEDIUM
CVSS Score 5.4
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
CWE CWE-347
Public Exploit ✅ No
Source OSV
Published 2022-12-14
Updated 2026-08-20
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
tendermint-light-client — —
tendermint-light-client-js — —
tendermint-light-client-verifier — —

Similar Threats

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