CVE-2026-59803

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-08. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Elevated
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.

rpcx through 1.9.3, fixed in commit 047aec1, contains a denial-of-service vulnerability in protocol.Message.Decode (protocol/message.go). When a message has the compression flag set, the payload is gzip-decompressed via util.Unzip with no limit on the decompressed output size. The only built-in size guard, protocol.MaxMessageLength, is checked against the compressed on-the-wire frame length, not the decompressed size, so it provides no protection. Because decoding (and decompression) occurs in readRequest before authentication, a single unauthenticated connection can send a small (under 2 MB) gzip-compressed message that expands to gigabytes of heap allocation, leading to out-of-memory conditions and service unavailability.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
—
EPSS
33.3%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 10, 2026

Advisory Details (4)

Auto-updated Jul 8, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
generic

rpcx - Denial of Service via Gzip Decompression Bomb in Wire Protocol | Advisories | VulnCheck

https://www.vulncheck.com/advisories/rpcx-denial-of-service-via-gzip-decompression-bomb-in-wire-protocol
github_pr

fix(protocol): cap decompressed payload size to prevent gzip bombs (#942)

Fix merged in smallnest/rpcx PR #943 on 2026-07-07 — awaiting tagged release

https://github.com/smallnest/rpcx/pull/943
generic

Unauthenticated gzip decompression bomb in rpcx wire protocol causes multi-GB memory allocation from a single small request · Issue #942 · smallnest/rpcx · GitHub

https://github.com/smallnest/rpcx/issues/942
github_commit

commit 047aec18efa7 (smallnest/rpcx)

Fix landed in smallnest/rpcx commit 047aec18efa7 — awaiting tagged release

https://github.com/smallnest/rpcx/commit/047aec18efa7d037105e2b72c36dd2ae05e1acc6

Vendor Advisories for CVE-2026-59803(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 39× 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.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:25 UTCEPSS rescore
  4. 2026-07-21 15:25 UTCEPSS rescore
  5. 2026-07-20 17:08 UTCEPSS rescore
  6. 2026-07-19 02:29 UTCEPSS rescore
  7. 2026-07-18 10:04 UTCEPSS rescore
  8. 2026-07-17 00:34 UTCGHSA enrichment
  9. 2026-07-16 17:03 UTCEPSS rescore
  10. 2026-07-16 12:58 UTCGHSA enrichment
  11. 2026-07-16 01:24 UTCGHSA enrichment
  12. 2026-07-15 16:57 UTCEPSS rescore
  13. 2026-07-15 16:57 UTCEPSS rescore
  14. 2026-07-15 13:49 UTCGHSA enrichment
  15. 2026-07-15 02:13 UTCGHSA enrichment
  16. 2026-07-15 02:00 UTCEPSS rescore
  17. 2026-07-15 02:00 UTCEPSS rescore
  18. 2026-07-14 14:39 UTCGHSA enrichment
  19. 2026-07-14 03:04 UTCGHSA enrichment
  20. 2026-07-13 22:31 UTCEPSS rescore
  21. 2026-07-13 15:30 UTCGHSA enrichment
  22. 2026-07-13 06:13 UTCEPSS rescore
  23. 2026-07-13 06:13 UTCEPSS rescore
  24. 2026-07-13 03:55 UTCGHSA enrichment
  25. 2026-07-12 16:21 UTCGHSA enrichment
Show 14 more
  1. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-12 04:47 UTCGHSA enrichment
  3. 2026-07-11 17:13 UTCGHSA enrichment
  4. 2026-07-11 08:27 UTCEPSS rescore
  5. 2026-07-11 08:27 UTCEPSS rescore
  6. 2026-07-11 05:39 UTCGHSA enrichment
  7. 2026-07-10 18:05 UTCGHSA enrichment
  8. 2026-07-10 06:30 UTCGHSA enrichment
  9. 2026-07-09 19:10 UTCEPSS rescore
  10. 2026-07-09 19:10 UTCEPSS rescore
  11. 2026-07-09 18:56 UTCGHSA enrichment
  12. 2026-07-09 07:22 UTCGHSA enrichment
  13. 2026-07-08 19:46 UTCEG score recompute
  14. 2026-07-08 19:44 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-59803?
CVE-2026-59803 is a high vulnerability published on July 8, 2026. rpcx through 1.9.3, fixed in commit 047aec1, contains a denial-of-service vulnerability in protocol.Message.Decode (protocol/message.go). When a message has the compression flag set, the payload is gzip-decompressed via util.Unzip with no limit on the decompressed output size. The only built-in…
When was CVE-2026-59803 disclosed?
CVE-2026-59803 was first published in the National Vulnerability Database on July 8, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59803 actively exploited?
CVE-2026-59803 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 33.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-59803?
CVE-2026-59803 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-59803?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59803, 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

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