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
Elevated
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

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
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.
EPSS PROB
0.7%
EPSS %ILE
53rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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 7× in last 7d / 43× 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 234 total refreshes for this CVE.

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

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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 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 0.7% probability of exploitation in the next 30 days (53rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-59803?
CVE-2026-59803 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-59803?
An upstream fix for CVE-2026-59803 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-59803 are linked in the Vendor Advisories panel on this page.

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