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: 0.4%, top 65% of all CVEs by exploit prediction. 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
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
6.5(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

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%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

August 19, 2026

Last Modified

August 21, 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
github Patch Available

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 13× in last 7d / 13× 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. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-24 15:47 UTCEG score recompute
  3. 2026-08-23 18:00 UTCEG score recompute
  4. 2026-08-23 00:19 UTCEPSS rescore
  5. 2026-08-22 20:13 UTCEG score recompute
  6. 2026-08-21 23:49 UTCEPSS rescore
  7. 2026-08-21 22:26 UTCEG score recompute
  8. 2026-08-21 22:00 UTCEG score recompute
  9. 2026-08-21 16:52 UTCEG score recompute
  10. 2026-08-20 22:55 UTCEPSS rescore
  11. 2026-08-19 21:19 UTCEG score recompute
  12. 2026-08-19 20:38 UTCEG score recompute
  13. 2026-08-19 20:37 UTCMITRE cvelistV5first tracked

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 in the National Vulnerability Database on August 19, 2026, with the most recent update on August 21, 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% probability of exploitation in the next 30 days, which ranks it in the top 64.6% of all scored CVEs.
What is the CVSS score of CVE-2026-54738?
CVE-2026-54738 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-54738?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54738, 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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