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Fencer Vulns
medium 5.4

CVE-2022-46149 json

Cap'n Proto vulnerable to out-of-bounds read due to logic error handling list-of-list.

published 2022-11-30 3 y ago modified 2026-11-09 4 h ago also EUVD-2022-7720 , GHSA-qqff-4vw4-f6hx , JLSEC-2026-1268 , RUSTSEC-2022-0068

cvss
5.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 61%
public exploits
0
none known

Summary

Cap'n Proto is a data interchange format and remote procedure call (RPC) system. Cap'n Proro prior to versions 0.7.1, 0.8.1, 0.9.2, and 0.10.3, as well as versions of Cap'n Proto's Rust implementation prior to 0.13.7, 0.14.11, and 0.15.2 are vulnerable to out-of-bounds read due to logic error handling list-of-list. This issue may lead someone to remotely segfault a peer by sending it a malicious message, if the victim performs certain actions on a list-of-pointer type. Exfiltration of memory is possible if the victim performs additional certain actions on a list-of-pointer type. To be vulnerable, an application must perform a specific sequence of actions, described in the GitHub Security Advisory. The bug is present in inlined code, therefore the fix will require rebuilding dependent applications. Cap'n Proto has C++ fixes available in versions 0.7.1, 0.8.1, 0.9.2, and 0.10.3. The `capnp` Rust crate has fixes available in versions 0.13.7, 0.14.11, and 0.15.2.

Patch / fix

  • crates.io capnp 0.13.7, 0.14.11, 0.15.2
  • capnproto capnproto 0.7.1, 0.9.2, 0.10.3
  • capnproto capnp 0.13.7, 0.14.11, 0.15.2
  • capnproto Debian 14, Debian 13, Debian 12 0.9.2-2
  • rust-capnp Debian 14, Debian 13, Debian 12 0.14.11-1.1

debian advisories DEBIAN-CVE-2022-46149

  • conmon-rs openshift 4.12 0.5.1-3.rhaos4.12.git.el8
  • conmon-rs openshift 4.12 0.5.1-3.rhaos4.12.git.el9

red hat advisories RHSA-2023:1408

  • capnproto SLE Module for Desktop Applications 15 SP4, openSUSE Leap 15.4 0.9.1-150400.3.4.1

suse advisories SUSE-SU-2022:4478-1

  • python-pycapnp openSUSE Tumbleweed 2.0.0-2.5

opensuse advisories openSUSE-SU-2025:15102-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-46149 updated cvss 5.4

capnproto: out of bounds read when handling a list of lists.

  • Red Hat OpenShift Container Platform 4.12 conmon-rs 0.5.1-3.rhaos4.12.git.el8, conmon-rs 0.5.1-3.rhaos4.12.git.el9
    fixed: vendor fix RHSA-2023:1408
  • Red Hat OpenShift Container Platform 4 cri-o Red Hat OpenShift Container Platform 4.12 NetworkManager 1.36.0-13.el8_6, NetworkManager-ovs 1.36.0-13.el8_6, NetworkManager-ppp 1.36.0-13.el8_6, NetworkManager-tui 1.36.0-13.el8_6, NetworkManager-adsl 1.36.0-13.el8_6, NetworkManager-team 1.36.0-13.el8_6, +13 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

0.95% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L
GitHub 3.1 5.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L
NVD 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
OSV 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

Affected packages

ecosystem package affected fixed in
crates.io capnp
>=0.15.0, <0.15.2
>=0.14.0, <0.14.11
<0.13.7
>=0.0.0-0, <0.13.7
>=0.14.0-0, <0.14.11
>=0.15.0-0, <0.15.2
0.15.2
0.14.11
0.13.7
julia capnproto_jll
all versions
 no fix listed

Affected products

  • capnproto capnproto

Classification

Weakness

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.