CVE-2026-45799
Wire: skipGroup() missing negative-length check allows 10-byte payload to crash any Wire-decoding service
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Analyzed | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.73% · top 46% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Mavencom.squareup.wire:wire-runtimeGHSA-7xpr-hc2w-34m9 (opens in a new tab)
- Mavencom.squareup.wire:wire-runtime-jvmGHSA-7xpr-hc2w-34m9 (opens in a new tab)
References (7)
- https://github.com/square/wire/security/advisories/GHSA-7xpr-hc2w-34m9 (opens in a new tab)x_refsource_CONFIRMexploit
- https://github.com/square/wire/pull/3595 (opens in a new tab)x_refsource_MISC
- https://github.com/square/wire/pull/3597 (opens in a new tab)x_refsource_MISC
- https://github.com/square/wire/commit/47d5b0dba53935d5332cd41a80a353b3fc90e7b0 (opens in a new tab)x_refsource_MISC
- https://github.com/square/wire/commit/e4e56fab38a547d9625f05c97f1d8f0bcc3a5773 (opens in a new tab)x_refsource_MISC
- https://github.com/square/wire/releases/tag/6.3.0 (opens in a new tab)x_refsource_MISC
- https://github.com/square/wire/releases/tag/7.0.0-alpha03 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-7xpr-hc2w-34m9 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-45799)Record last updated .