CVE-2026-59803

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM 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
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: Elevated riskExposed: 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(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 computed
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
52%
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 22× in last 7d / 114× 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.

Showing the most recent 100 of 166 total refreshes for this CVE.

  1. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-25 10:11 UTCGHSA enrichment
  3. 2026-08-24 20:32 UTCEG score recompute
  4. 2026-08-24 20:32 UTCGHSA enrichment
  5. 2026-08-24 04:00 UTCGHSA enrichment
  6. 2026-08-23 14:49 UTCGHSA enrichment
  7. 2026-08-23 03:15 UTCEG score recompute
  8. 2026-08-23 03:15 UTCGHSA enrichment
  9. 2026-08-23 00:19 UTCEPSS rescore
  10. 2026-08-22 15:20 UTCGHSA enrichment
  11. 2026-08-22 03:46 UTCEG score recompute
  12. 2026-08-22 03:46 UTCGHSA enrichment
  13. 2026-08-21 23:49 UTCEPSS rescore
  14. 2026-08-21 15:34 UTCGHSA enrichment
  15. 2026-08-21 03:59 UTCEG score recompute
  16. 2026-08-21 03:59 UTCGHSA enrichment
  17. 2026-08-20 22:55 UTCEPSS rescore
  18. 2026-08-20 15:37 UTCGHSA enrichment
  19. 2026-08-20 01:58 UTCEG score recompute
  20. 2026-08-20 01:58 UTCGHSA enrichment
  21. 2026-08-19 17:04 UTCEPSS rescore
  22. 2026-08-19 10:17 UTCGHSA enrichment
  23. 2026-08-18 22:28 UTCEG score recompute
  24. 2026-08-18 22:28 UTCGHSA enrichment
  25. 2026-08-18 13:48 UTCEPSS rescore
Show 75 more
  1. 2026-08-18 10:49 UTCGHSA enrichment
  2. 2026-08-17 22:28 UTCEG score recompute
  3. 2026-08-17 22:28 UTCGHSA enrichment
  4. 2026-08-17 13:47 UTCEPSS rescore
  5. 2026-08-17 08:41 UTCGHSA enrichment
  6. 2026-08-16 21:08 UTCEG score recompute
  7. 2026-08-16 21:08 UTCGHSA enrichment
  8. 2026-08-16 14:56 UTCEPSS rescore
  9. 2026-08-16 09:33 UTCEG score recompute
  10. 2026-08-16 09:33 UTCGHSA enrichment
  11. 2026-08-16 02:14 UTCEPSS rescore
  12. 2026-08-15 22:00 UTCGHSA enrichment
  13. 2026-08-15 10:26 UTCEG score recompute
  14. 2026-08-15 10:26 UTCGHSA enrichment
  15. 2026-08-15 01:30 UTCEPSS rescore
  16. 2026-08-14 22:52 UTCGHSA enrichment
  17. 2026-08-14 11:18 UTCGHSA enrichment
  18. 2026-08-13 23:43 UTCEG score recompute
  19. 2026-08-13 23:43 UTCGHSA enrichment
  20. 2026-08-13 22:00 UTCEPSS rescore
  21. 2026-08-13 12:08 UTCGHSA enrichment
  22. 2026-08-13 00:35 UTCEG score recompute
  23. 2026-08-13 00:35 UTCGHSA enrichment
  24. 2026-08-12 13:51 UTCEPSS rescore
  25. 2026-08-12 13:01 UTCGHSA enrichment
  26. 2026-08-12 01:26 UTCGHSA enrichment
  27. 2026-08-11 13:53 UTCEG score recompute
  28. 2026-08-11 13:53 UTCGHSA enrichment
  29. 2026-08-11 02:19 UTCEG score recompute
  30. 2026-08-11 02:19 UTCGHSA enrichment
  31. 2026-08-11 00:00 UTCEPSS rescore
  32. 2026-08-10 14:45 UTCGHSA enrichment
  33. 2026-08-10 03:11 UTCGHSA enrichment
  34. 2026-08-09 15:37 UTCEG score recompute
  35. 2026-08-09 15:37 UTCGHSA enrichment
  36. 2026-08-09 13:46 UTCEPSS rescore
  37. 2026-08-09 04:04 UTCEG score recompute
  38. 2026-08-09 04:04 UTCGHSA enrichment
  39. 2026-08-08 16:37 UTCEPSS rescore
  40. 2026-08-08 16:30 UTCGHSA enrichment
  41. 2026-08-08 04:56 UTCEG score recompute
  42. 2026-08-08 04:56 UTCGHSA enrichment
  43. 2026-08-07 17:22 UTCEG score recompute
  44. 2026-08-07 17:22 UTCGHSA enrichment
  45. 2026-08-07 05:48 UTCGHSA enrichment
  46. 2026-08-06 18:14 UTCEG score recompute
  47. 2026-08-06 18:14 UTCGHSA enrichment
  48. 2026-08-06 13:47 UTCEPSS rescore
  49. 2026-08-06 06:40 UTCEG score recompute
  50. 2026-08-06 06:40 UTCGHSA enrichment
  51. 2026-08-05 19:17 UTCEPSS rescore
  52. 2026-08-05 19:06 UTCGHSA enrichment
  53. 2026-08-05 07:33 UTCGHSA enrichment
  54. 2026-08-04 19:57 UTCEG score recompute
  55. 2026-08-04 19:57 UTCGHSA enrichment
  56. 2026-08-04 15:10 UTCEPSS rescore
  57. 2026-08-04 10:39 UTCEPSS rescore
  58. 2026-08-04 08:22 UTCGHSA enrichment
  59. 2026-08-03 19:12 UTCEG score recompute
  60. 2026-08-03 19:12 UTCGHSA enrichment
  61. 2026-08-03 10:36 UTCEPSS rescore
  62. 2026-08-03 07:38 UTCGHSA enrichment
  63. 2026-08-02 20:00 UTCGHSA enrichment
  64. 2026-08-02 08:26 UTCEG score recompute
  65. 2026-08-02 08:26 UTCGHSA enrichment
  66. 2026-08-02 02:27 UTCEPSS rescore
  67. 2026-08-01 20:52 UTCGHSA enrichment
  68. 2026-08-01 09:18 UTCEG score recompute
  69. 2026-08-01 09:18 UTCGHSA enrichment
  70. 2026-08-01 04:16 UTCEPSS rescore
  71. 2026-07-31 21:44 UTCGHSA enrichment
  72. 2026-07-31 10:10 UTCGHSA enrichment
  73. 2026-07-30 22:37 UTCEG score recompute
  74. 2026-07-30 22:37 UTCGHSA enrichment
  75. 2026-07-30 16:28 UTCEPSS rescore

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 1% probability of exploitation in the next 30 days, which ranks it in the top 48.1% of all scored CVEs.
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.

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