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% (18th 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

Also known asEUVD-2026-42942 (ENISA EUVD)Source: ENISA EUVD

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 impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity74% × 45%
Impact severity (EG Severity): CVSS 7.4 of 10. Never the KEV-floored or EPSS-lifted EG Score.
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
18th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.4): severity, escalated by confirmed exploitation. This CVE's 7.4 is its impact severity (EG Severity), not escalated.

EG Severity
7.4 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-07). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

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.

The score's inputs: 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

October 25, 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 7× in last 7d / 30× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 174 rows 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 74 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

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

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 CPPHTTPLIB_MBEDTLS_SUPPORT or CPPHTTPLIB_WOLFSSL_SUPPORT 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 October 25, 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 (18th 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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-54919

Explore →

Is Your Infrastructure Affected by CVE-2026-54919?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs