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CVE-2023-34449

18
FAUCET Score

CVE-2023-34449 is a medium-severity vulnerability affecting ink! smart contracts (versions 4.0.0 to 4.2.0) built on the Substrate framework. The flaw lies in the incorrect decoding of return values when using delegate call mechanisms, potentially leading to data integrity issues. With a CVSS score of 5.3, this network-exploitable vulnerability requires no user interaction and has a low impact on integrity, but no impact on confidentiality or availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.0.0, < 4.2.1CPE matchmatch criteria
cpe:2.3:a:parity:ink\!:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.97%
Probability of exploitation in next 30 days
EPSS Percentile
58.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0097 is in the 36th percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
rustpatch availablevia ghsa
Product: inkFixed in: 4.2.1
rustpatch availablevia ghsa
Product: ink_envFixed in: 4.2.1

Vendor Advisories (1)

rustGHSA-853p-5678-hv8fmedium

ink! vulnerable to incorrect decoding of storage value when using `DelegateCall`

Jun 14, 2023

References

docs.rs / ink_env/4.2.0/ink_env/call/struct.CallBuilder.html
ExploitThird Party Advisory
docs.rs / ink_env/4.2.0/ink_env/fn.invoke_contract_delegate.html
ExploitThird Party Advisory
github.com / paritytech/ink/commit/f1407ee9f87e5f64d467a22d26ee88f61db7f3db
Patch
github.com / paritytech/ink/pull/1450
PatchVendor Advisory
github.com / paritytech/ink/security/advisories/GHSA-853p-5678-hv8f
ExploitPatchVendor Advisory