CVE-2026-54738

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (44th percentile of EPSS-scored CVEs). 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
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Lemmy is a link aggregator and forum for the fediverse. Prior to 0.19.19 and 1.0.0-beta.1, actix-web ConnectionInfo::realip_remote_addr reads the first value of X-Forwarded-For as the client address used by raw_ip_key in crates/utils/src/rate_limit/mod.rs. Lemmy's bundled docker/nginx.conf uses $proxy_add_x_forwarded_for instead of $remote_addr, which appends the real client address to an X-Forwarded-For value supplied by the client. An unauthenticated attacker can therefore place a different spoofed address first on each request and receive a new rate-limit bucket, bypassing limits on POST /api/v4/account/auth/register, POST /api/v4/account/auth/login, POST /api/v4/post, POST /api/v4/comment, GET /api/v4/search, POST /api/v4/image, and POST /api/v4/account/import_settings. This permits excessive account creation, brute-force attempts, spam, scraping, uploads, and repeated imports. This issue is fixed in versions 0.19.19 and 1.0.0-beta.1.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
44
EG Risk 44/100CISA 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
Severity65% × 45%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
44th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (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

August 19, 2026

Last Modified

September 9, 2026

Advisory Details (8)

Auto-updated Aug 19, 2026
Patch available. Sources: github_commit, github_release, github, github_pr.
generic

2026-06-09 - Lemmy Release v0.19.19

https://join-lemmy.org/news/2026-06-09_-_Lemmy_Release_v0.19.19
github_release Patch Available

1.0.0-beta.1

Patch available: LemmyNet/lemmy 1.0.0-beta.1 (pre-release)

https://github.com/LemmyNet/lemmy/releases/tag/1.0.0-beta.1
github_release Patch Available

0.19.19

Patch available: LemmyNet/lemmy 0.19.19

https://github.com/LemmyNet/lemmy/releases/tag/0.19.19
github_commit Patch Available

commit 8b5b2aa78417 (LemmyNet/lemmy)

Patch available: LemmyNet/lemmy 1.0.0-beta.1 (contains commit 8b5b2aa78417)

https://github.com/LemmyNet/lemmy/commit/8b5b2aa78417b53ff3622c01f5bed2f1590f3b82
github_commit Patch Available

commit 41513c89ceec (LemmyNet/lemmy)

Patch available: LemmyNet/lemmy 0.19.19 (contains commit 41513c89ceec)

https://github.com/LemmyNet/lemmy/commit/41513c89ceecee719bff05acfe613e3b1e85f23c
github_pr Patch Available

In nginx config use `$remote_addr`

Patch available: LemmyNet/lemmy 1.0.0-beta.1 (PR #6575 merged 2026-06-08)

https://github.com/LemmyNet/lemmy/pull/6575
github_pr Patch Available

[0.19] In nginx config use `$remote_addr`

Patch available: LemmyNet/lemmy 0.19.19 (PR #6574 merged 2026-06-08)

https://github.com/LemmyNet/lemmy/pull/6574
githubMentions a patch (unverified)

Rate limit bypass via X-Forwarded-For header spoofing in actix-web ConnectionInfo · Advisory · LemmyNet/lemmy · GitHub

https://github.com/LemmyNet/lemmy/security/advisories/GHSA-2hrg-7x4g-9vpg

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 50× 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. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:12 UTCEPSS rescore
  3. 2026-10-08 06:35 UTCEG score recompute
  4. 2026-10-07 23:48 UTCEPSS rescore
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  24. 2026-09-27 13:48 UTCEPSS rescore
  25. 2026-09-27 05:56 UTCEG score recompute
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  1. 2026-09-26 15:59 UTCEPSS rescore
  2. 2026-09-25 09:06 UTCEG score recompute
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 11:19 UTCEG score recompute
  5. 2026-09-23 17:54 UTCEPSS rescore
  6. 2026-09-22 15:46 UTCEG score recompute
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  8. 2026-09-20 20:16 UTCEPSS rescore
  9. 2026-09-19 22:11 UTCEG score recompute
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  11. 2026-09-18 19:28 UTCEPSS rescore
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  21. 2026-09-13 16:47 UTCEPSS rescore
  22. 2026-09-12 15:56 UTCEG score recompute
  23. 2026-09-11 18:09 UTCEG score recompute
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-10 20:22 UTCEG score recompute
  26. 2026-09-10 09:35 UTCEPSS rescore
  27. 2026-09-09 05:59 UTCEG score recompute
  28. 2026-09-08 22:01 UTCEPSS rescore
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  30. 2026-09-07 16:01 UTCEPSS rescore
  31. 2026-09-07 10:25 UTCEG score recompute
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  36. 2026-09-02 21:15 UTCEG score recompute
  37. 2026-09-02 14:12 UTCEPSS rescore
  38. 2026-09-01 19:59 UTCEG score recompute
  39. 2026-09-01 13:54 UTCEPSS rescore
  40. 2026-09-01 04:40 UTCEPSS rescore
  41. 2026-08-31 00:24 UTCEG score recompute
  42. 2026-08-30 19:17 UTCEPSS rescore
  43. 2026-08-30 02:37 UTCEG score recompute
  44. 2026-08-30 01:22 UTCEPSS rescore
  45. 2026-08-29 04:50 UTCEG score recompute
  46. 2026-08-28 21:41 UTCEPSS rescore
  47. 2026-08-28 07:02 UTCEG score recompute
  48. 2026-08-27 14:25 UTCEPSS rescore
  49. 2026-08-27 09:12 UTCEG score recompute
  50. 2026-08-26 14:46 UTCEPSS rescore
  51. 2026-08-26 11:22 UTCEG score recompute
  52. 2026-08-25 13:49 UTCEPSS rescore
  53. 2026-08-24 15:47 UTCEG score recompute
  54. 2026-08-23 18:00 UTCEG score recompute
  55. 2026-08-23 00:19 UTCEPSS rescore
  56. 2026-08-22 20:13 UTCEG score recompute
  57. 2026-08-21 23:49 UTCEPSS rescore
  58. 2026-08-21 22:26 UTCEG score recompute
  59. 2026-08-21 22:00 UTCEG score recompute
  60. 2026-08-21 16:52 UTCEG score recompute
  61. 2026-08-20 22:55 UTCEPSS rescore
  62. 2026-08-19 21:19 UTCEG score recompute
  63. 2026-08-19 20:38 UTCEG score recompute
  64. 2026-08-19 20:37 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-54738?
CVE-2026-54738 is a medium vulnerability published on August 19, 2026. Lemmy is a link aggregator and forum for the fediverse. Prior to 0.19.19 and 1.0.0-beta.1, actix-web ConnectionInfo::realipremoteaddr reads the first value of X-Forwarded-For as the client address used by rawipkey in crates/utils/src/ratelimit/mod.rs. Lemmy's bundled docker/nginx.conf uses…
When was CVE-2026-54738 disclosed?
CVE-2026-54738 was first published on August 19, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54738 actively exploited?
CVE-2026-54738 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54738?
CVE-2026-54738 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54738?
A fix for CVE-2026-54738 is available: update to the fixed version the vendor names in its advisory.

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