HOMEVULNERABILITIESCVE-2023-34449
MEDIUM

CVE-2023-34449

CWE-253Published: June 14, 2023· Updated: Jun 17, 2026

5.3
CVSS v3.1

Official Description

ink! is an embedded domain specific language to write smart contracts in Rust for blockchains built on the Substrate framework. Starting in version 4.0.0 and prior to version 4.2.1, the return value when using delegate call mechanics, either through `CallBuilder::delegate` or `ink_env::invoke_contract_delegate`, is decoded incorrectly. This bug was related to the mechanics around decoding a call's return buffer, which was changed as part of pull request 1450. Since this feature was only released in ink! 4.0.0, no previous versions are affected. Users who have an ink! 4.x series contract should upgrade to 4.2.1 to receive a patch.

NVD Source

Technical Analysis

CVE-2023-34449 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected Vendors & Products

parity1 product(s)
ink\!
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/paritytech/ink/commit/f1407ee9f87e5f64d467a22d26ee88f61db7f3db
PATCHhttps://github.com/paritytech/ink/pull/1450
PATCHhttps://github.com/paritytech/ink/security/advisories/GHSA-853p-5678-hv8f
PATCHhttps://github.com/paritytech/ink/commit/f1407ee9f87e5f64d467a22d26ee88f61db7f3db
PATCHhttps://github.com/paritytech/ink/pull/1450
PATCHhttps://github.com/paritytech/ink/security/advisories/GHSA-853p-5678-hv8f
ADVISORYhttps://docs.rs/ink_env/4.2.0/ink_env/call/struct.CallBuilder.html#method.delegate
ADVISORYhttps://docs.rs/ink_env/4.2.0/ink_env/fn.invoke_contract_delegate.html
ADVISORYhttps://docs.rs/ink_env/4.2.0/ink_env/call/struct.CallBuilder.html#method.delegate
ADVISORYhttps://docs.rs/ink_env/4.2.0/ink_env/fn.invoke_contract_delegate.html

All References (10)

→
https://docs.rs/ink_env/4.2.0/ink_env/call/struct.CallBuilder.html#method.delegateExploit · Third Party Advisory
→
https://docs.rs/ink_env/4.2.0/ink_env/fn.invoke_contract_delegate.htmlExploit · Third Party Advisory
→
https://github.com/paritytech/ink/commit/f1407ee9f87e5f64d467a22d26ee88f61db7f3dbPatch
→
https://github.com/paritytech/ink/pull/1450Patch · Vendor Advisory
→
https://github.com/paritytech/ink/security/advisories/GHSA-853p-5678-hv8fExploit · Patch · Vendor Advisory
→
https://docs.rs/ink_env/4.2.0/ink_env/call/struct.CallBuilder.html#method.delegateExploit · Third Party Advisory
→
https://docs.rs/ink_env/4.2.0/ink_env/fn.invoke_contract_delegate.htmlExploit · Third Party Advisory
→
https://github.com/paritytech/ink/commit/f1407ee9f87e5f64d467a22d26ee88f61db7f3dbPatch
→
https://github.com/paritytech/ink/pull/1450Patch · Vendor Advisory
→
https://github.com/paritytech/ink/security/advisories/GHSA-853p-5678-hv8fExploit · Patch · Vendor Advisory

Quick Facts

CVE IDCVE-2023-34449
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-253
CISA KEVNo
Affected1 vendor(s)
PublishedJun 14, 2023

Related CVEs (CWE-253)

CVE-2023-4501
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CVE-2017-7474
9.8
CVE-2026-35091
8.2
CVE-2023-49286
7.5
CVE-2026-46419
7.5
CVE-2025-57767
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Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-34449 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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