CVE-2026-54919

HIGHPre-NVD 7.47.4
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 7.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (16th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
7.4EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. In affected Mbed TLS backend versions from 0.31.0 through 0.46.1 and wolfSSL backend versions from 0.33.0 through 0.46.1, when cpp-httplib is built with CPPHTTPLIB_MBEDTLS_SUPPORT or CPPHTTPLIB_WOLFSSL_SUPPORT and a client connects to an IP-literal host with server certificate verification enabled, SSLClient and Client in HTTPS mode skip certificate chain validation and WebSocketClient on the Mbed TLS backend skips verification altogether, allowing a man-in-the-middle attacker positioned to intercept traffic to present a crafted certificate and read or modify the traffic. This issue is fixed in version 0.47.0.

CVSS v3
7.4
EG Score
7.4HIGHmedium confidence
EG Risk
33
EG Risk 33/100

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 (value × EchelonGraph’s weight)
Severity74% × 45%
The EG Score, 7.4 of 10.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
16th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 10, 2026

Last Modified

July 14, 2026

Advisory Details (3)

Auto-updated Jul 10, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

TLS certificate chain verification bypassed for IP-literal hosts on Mbed TLS and wolfSSL backends · Advisory · yhirose/cpp-httplib · GitHub

Affected: v0.47.0. Chain verification now remains enabled for IP-literal hosts, and the cer

https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-8ffh-4p95-g3p2
GitHub release Patch Available

v0.47.0

Patch available: yhirose/cpp-httplib v0.47.0

https://github.com/yhirose/cpp-httplib/releases/tag/v0.47.0
GitHub commit Patch Available

commit fa981cedae00 (yhirose/cpp-httplib)

Patch available: yhirose/cpp-httplib v0.47.0 (contains commit fa981cedae00)

https://github.com/yhirose/cpp-httplib/commit/fa981cedae004ea9d946f1392b9dec22fac6fee6

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
cpp-httplib0.11.4+ds-1 ... 0.41.0+ds-3~bpo13+1 (27 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
cpp-httplib0.18.7-1 ... 0.41.0+ds-3~bpo13+1 (9 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
cpp-httplib0.18.7-1 ... 0.41.0+ds-3~bpo13+1 (8 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 34× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 138 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 38 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  3. 2026-10-12 15:56 UTCEG score recompute
  4. 2026-10-11 19:39 UTCEG score recompute
  5. 2026-10-11 16:54 UTCEG score recompute
  6. 2026-10-11 14:17 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  18. 2026-10-01 15:11 UTCEG score recompute
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  20. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  21. 2026-09-28 09:48 UTCEG score recompute
  22. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  23. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  24. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  25. 2026-09-24 11:13 UTCEG score recompute
Show 75 more
  1. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  2. 2026-09-23 05:45 UTCEG score recompute
  3. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  4. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  5. 2026-09-18 05:18 UTCEG score recompute
  6. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  7. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  8. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  9. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  10. 2026-09-13 23:40 UTCEG score recompute
  11. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  12. 2026-09-12 16:09 UTCEG score recompute
  13. 2026-09-12 02:57 UTCEG score recompute
  14. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  15. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  16. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  17. 2026-09-08 02:54 UTCEG score recompute
  18. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  19. 2026-09-06 13:57 UTCEG score recompute
  20. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  21. 2026-09-05 21:44 UTCEG score recompute
  22. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  23. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  24. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  25. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  26. 2026-08-30 19:36 UTCEG score recompute
  27. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  28. 2026-08-30 06:24 UTCEG score recompute
  29. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  30. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  31. 2026-08-27 21:41 UTCEG score recompute
  32. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  33. 2026-08-27 00:48 UTCEG score recompute
  34. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  35. 2026-08-25 15:52 UTCEG score recompute
  36. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  37. 2026-08-25 02:29 UTCEG score recompute
  38. 2026-08-24 13:17 UTCEG score recompute
  39. 2026-08-23 10:53 UTCEG score recompute
  40. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  41. 2026-08-22 08:29 UTCEG score recompute
  42. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  43. 2026-08-21 06:05 UTCEG score recompute
  44. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  45. 2026-08-20 03:38 UTCEG score recompute
  46. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  47. 2026-08-19 00:43 UTCEG score recompute
  48. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  49. 2026-08-17 22:12 UTCEG score recompute
  50. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  51. 2026-08-16 15:45 UTCEG score recompute
  52. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  53. 2026-08-16 02:33 UTCEG score recompute
  54. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  55. 2026-08-15 13:22 UTCEG score recompute
  56. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  57. 2026-08-14 10:58 UTCEG score recompute
  58. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  59. 2026-08-12 19:22 UTCEG score recompute
  60. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  61. 2026-08-11 16:57 UTCEG score recompute
  62. 2026-08-11 03:45 UTCEG score recompute
  63. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  64. 2026-08-10 01:18 UTCEG score recompute
  65. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  66. 2026-08-08 22:55 UTCEG score recompute
  67. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  68. 2026-08-07 20:32 UTCEG score recompute
  69. 2026-08-06 18:08 UTCEG score recompute
  70. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  71. 2026-08-06 04:56 UTCEG score recompute
  72. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  73. 2026-08-04 23:22 UTCEG score recompute
  74. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  75. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.2% · 6th percentile

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-54919?
CVE-2026-54919 is a high-severity vulnerability; its CVE record was published on July 10, 2026. cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. In affected Mbed TLS backend versions from 0.31.0 through 0.46.1 and wolfSSL backend versions from 0.33.0 through 0.46.1, when cpp-httplib is built with CPPHTTPLIBMBEDTLSSUPPORT or CPPHTTPLIBWOLFSSLSUPPORT and a…
When was the CVE record for CVE-2026-54919 published?
The CVE record for CVE-2026-54919 was published on July 10, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 14, 2026; the record at its source may have been updated since.
Is CVE-2026-54919 actively exploited?
CVE-2026-54919 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (16th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54919?
CVE-2026-54919 has a CVSS base score of 7.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54919?
A fix for CVE-2026-54919 is available: update to the fixed version the vendor names in its advisory.

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