Vulnerability-Lookup

GHSA-HGRM-22X6-R8C8

Vulnerability from github – Published: 2026-07-08 21:30 – Updated: 2026-07-08 21:30

Details

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.

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-59803"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-409"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-08T20:16:55Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-hgrm-22x6-r8c8",
  "modified": "2026-07-08T21:30:29Z",
  "published": "2026-07-08T21:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59803"
    },
    {
      "type": "WEB",
      "url": "https://github.com/smallnest/rpcx/issues/942"
    },
    {
      "type": "WEB",
      "url": "https://github.com/smallnest/rpcx/pull/943"
    },
    {
      "type": "WEB",
      "url": "https://github.com/smallnest/rpcx/commit/047aec18efa7d037105e2b72c36dd2ae05e1acc6"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/rpcx-denial-of-service-via-gzip-decompression-bomb-in-wire-protocol"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-59803 (GCVE-0-2026-59803)

Vulnerability from cvelistv5 – Published: 2026-07-08 19:42 – Updated: 2026-07-09 13:30 X_Open Source

Title

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

Summary

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)

Assigner

VulnCheck

References

4 references

URL	Tags
https://github.com/smallnest/rpcx/issues/942	technical-descriptionexploit
https://github.com/smallnest/rpcx/pull/943	issue-tracking
https://github.com/smallnest/rpcx/commit/047aec18…	patch
https://www.vulncheck.com/advisories/rpcx-denial-…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
smallnest	rpcx	Affected: 0 , ≤ 1.9.3 (semver) Unaffected: 047aec18efa7d037105e2b72c36dd2ae05e1acc6 (git)

Date Public

2026-07-06 00:00

Credits

George Chen

Show details on NVD website

JSON

To clipboard

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                  },
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-09T13:29:48.308645Z",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-HGRM-22X6-R8C8

CVE-2026-59803 (GCVE-0-2026-59803)

Tags

Sightings

Nomenclature