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Fencer Vulns
high 7.5

CVE-2026-45799 json

Wire: skipGroup() missing negative-length check allows 10-byte payload to crash any Wire-decoding service

published 2026-05-19 5 mo ago modified 2026-10-24 15 d ago also GHSA-7xpr-hc2w-34m9 , EUVD-2026-45301

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 54%
public exploits
0
none known

Summary

Wire provides gRPC and protocol buffers for Android, Kotlin, Swift, and Java. Prior to 6.3.0 and 7.0.0-alpha03, ByteArrayProtoReader32.skipGroup() and ProtoReader.skipGroup() in wire-runtime do not validate that a LENGTH_DELIMITED field length is non-negative before skip(), allowing a crafted protobuf varint encoding -128 as a signed Int to make skip(-128) move the internal position negative and make the next readByte() throw ArrayIndexOutOfBoundsException instead of the documented IOException or ProtocolException, which can crash services using ProtoAdapter.decode(byte[]) on untrusted payloads. This issue is fixed in versions 6.3.0 and 7.0.0-alpha03.

Patch / fix

  • maven com.squareup.wire:wire-runtime-jvm 6.3.0, 7.0.0-alpha03
  • maven com.squareup.wire:wire-runtime 6.3.0, 7.0.0-alpha03
  • squareup wire 6.3.0

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-2026-45799 updated cvss 7.5

com.squareup.wire/wire-runtime: com.squareup.wire/wire-runtime-jvm: Wire: Remote Denial of Service due to improper protobuf length validation

  • Red Hat build of Apache Camel 4 for Quarkus 3 wire-runtime, wire-runtime-jvm Red Hat build of Apicurio Registry 3 wire-runtime, wire-runtime-jvm
    affected: no fix available
  • Red Hat Fuse 7 wire-runtime
    affected: no fix planned “Out of support scope”
  • Red Hat Build of Apache Camel 3.33.3.SP2 wire-runtime 6.4.7, wire-runtime-jvm 6.4.7
    fixed: vendor fix RHSA-2026:70257
  • Red Hat Build of Apache Camel 3.33.3.SP2 jimfs 1.1, jna 5.8.0, bcel 6.7.0, gax 2.74.1, icu4j 78.2, joni 2.2.6, +1615 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
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.73% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/square/wire/security/advisories/GHSA-7xpr-hc2w-34m9 referenced PoC, tagged "exploit" by a source, unverified

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
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
maven com.squareup.wire:wire-runtime-jvm
<6.3.0
>=7.0.0-alpha01, <7.0.0-alpha03
6.3.0
7.0.0-alpha03
maven com.squareup.wire:wire-runtime
<6.3.0
>=7.0.0-alpha01, <7.0.0-alpha03
6.3.0
7.0.0-alpha03

Affected products

  • square wire

Classification

Weakness
  • CWE-129 Improper Validation of Array Index

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.