Skip to content
Fencer Vulns
high 7.5

CVE-2024-7884 json

Memory leak when calling a canister method via `ic_cdk::call`

published 2024-09-05 2 y ago modified 2026-06-17 4 mo ago also GHSA-rwq6-crjg-9cpw , RUSTSEC-2024-0372 , EUVD-2024-2871

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits
0
none known

Summary

When a canister method is called via ic_cdk::call* , a new Future CallFuture is created and can be awaited by the caller to get the execution result. Internally, the state of the Future is tracked and stored in a struct called CallFutureState. A bug in the polling implementation of the CallFuture allows multiple references to be held for this internal state and not all references were dropped before the Future is resolved. Since we have unaccounted references held, a copy of the internal state ended up being persisted in the canister's heap and thus causing a memory leak. Impact Canisters built in Rust with ic_cdk and ic_cdk_timers are affected. If these canisters call a canister method, use timers or heartbeat, they will likely leak a small amount of memory on every such operation. In the worst case, this could lead to heap memory exhaustion triggered by an attacker. Motoko based canisters are not affected by the bug. PatchesThe patch has been backported to all minor versions between >= 0.8.0, <= 0.15.0. The patched versions available are 0.8.2, 0.9.3, 0.10.1, 0.11.6, 0.12.2, 0.13.5, 0.14.1, 0.15.1 and their previous versions have been yanked. WorkaroundsThere are no known workarounds at the moment. Developers are recommended to upgrade their canister as soon as possible to the latest available patched version of ic_cdk to avoid running out of Wasm heap memory. Upgrading the canisters (without updating `ic_cdk`) also frees the leaked memory but it's only a temporary solution.

Patch / fix

  • crates.io ic_cdk 0.8.2, 0.9.3, 0.10.1, 0.11.6, 0.12.2, 0.13.5, 0.14.1, 0.15.1
  • crates.io ic-cdk 0.8.2, 0.9.3, 0.10.1, 0.11.6, 0.12.2, 0.13.5, 0.14.1, 0.15.1, 0.16.0
  • Internet Computer ic-cdk 0.8.2, 0.9.3, 0.10.1, 0.11.5, 0.11.6, 0.12.2, 0.13.4, 0.13.5, 0.14.1, 0.15.1
  • internet_computer ic-cdk 0.8.2, 0.9.3, 0.10.1, 0.11.5, 0.12.2, 0.13.4, 0.14.1, 0.15.1

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.69% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
crates.io ic_cdk
>=0.8.0, <0.8.2
>=0.9.0, <0.9.3
>=0.10.0, <0.10.1
>=0.11.0, <0.11.6
>=0.12.0, <0.12.2
>=0.13.0, <0.13.5
>=0.14.0, <0.14.1
>=0.15.0, <0.15.1
0.8.2
0.9.3
0.10.1
0.11.6
0.12.2
0.13.5
0.14.1
0.15.1
crates.io ic-cdk
>=0.8.0, <0.8.2
>=0.9.0-0, <0.9.3
>=0.10.0-0, <0.10.1
>=0.11.0-0, <0.11.6
>=0.12.0-0, <0.12.2
>=0.13.0-0, <0.13.5
>=0.14.0-0, <0.14.1
>=0.15.0-0, <0.15.1
>=0.16.0-0, <0.16.0
0.8.2
0.9.3
0.10.1
0.11.6
0.12.2
0.13.5
0.14.1
0.15.1
0.16.0

Affected products

  • Internet Computer ic-cdk
  • internet_computer ic-cdk

Classification

Weakness
  • CWE-401 Missing Release of Memory after Effective Lifetime

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.