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.
CVE-2026-45799
HIGHPre-NVD 7.57.5—Elevated
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 60% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.5
- EG Score
- 7.5(medium)
- EG Risk
- 65(Attend)EG Risk 65/100SSVC: Attend
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity75% × 45%Exploitation40% × 40%Automatability100% × 15%Action: Remediate soon — notable exploitation risk. - EPSS
- 39.6%
- KEV
- Not listed
Published
May 19, 2026
Last Modified
July 23, 2026
Advisory Details (5)
Auto-updated Jul 17, 2026🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_pr.
github Patch Available🟡 PoC Available
skipGroup() missing negative-length check allows 10-byte payload to crash any Wire-decoding service · Advisory · square/wire · GitHub
https://github.com/square/wire/security/advisories/GHSA-7xpr-hc2w-34m9github_pr
Add negative-length check in skipGroup
Fix merged in square/wire PR #3597 on 2026-05-13 — awaiting tagged release
https://github.com/square/wire/pull/3597github_pr
Add negative-length check in skipGroup
Fix merged in square/wire PR #3595 on 2026-05-12 — awaiting tagged release
https://github.com/square/wire/pull/3595github_commit
commit e4e56fab38a5 (square/wire)
Fix landed in square/wire commit e4e56fab38a5 — awaiting tagged release
https://github.com/square/wire/commit/e4e56fab38a547d9625f05c97f1d8f0bcc3a5773github_commit
commit 47d5b0dba539 (square/wire)
Fix landed in square/wire commit 47d5b0dba539 — awaiting tagged release
https://github.com/square/wire/commit/47d5b0dba53935d5332cd41a80a353b3fc90e7b0Vendor Advisories for CVE-2026-45799(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(2 across 1 ecosystem)
Maven(2)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| com.squareup.wire:wire-runtime | 7.0.0-alpha01, 7.0.0-alpha02 | 7.0.0-alpha03 | — |
| com.squareup.wire:wire-runtime-jvm | 3.0.0-alpha03 ... 5.3.3 (60 versions) | — | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 7× in last 7d / 7× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-23 14:18 UTCEPSS rescore
- 2026-07-23 03:16 UTCEG score recompute
- 2026-07-22 14:08 UTCEPSS rescore
- 2026-07-21 15:24 UTCEPSS rescore
- 2026-07-20 17:08 UTCEPSS rescore
- 2026-07-19 14:31 UTCEPSS rescore
- 2026-07-19 02:29 UTCEPSS rescore
- 2026-06-14 23:18 UTCEPSS rescore
- 2026-06-13 23:00 UTCEPSS rescore
- 2026-06-12 23:12 UTCEPSS rescore
- 2026-05-24 06:13 UTCEG score recompute
Related CVEs(same CWE)
Same CWE
10 shownCWE-129
Frequently asked(5)
What is CVE-2026-45799?
CVE-2026-45799 is a high vulnerability published on May 19, 2026. 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…
When was CVE-2026-45799 disclosed?
CVE-2026-45799 was first published in the National Vulnerability Database on May 19, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45799 actively exploited?
CVE-2026-45799 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 39.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45799?
CVE-2026-45799 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-45799?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45799, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-45799
Is Your Infrastructure Affected by CVE-2026-45799?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.