CVE-2026-11856

highpriority · track · 0OT risk · elevatedEPSS 0.007 · 53 %ileDEEUFRUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.69% (53rd) EPSS
CVSS 8.1 · high
Is it mine?
195 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · cert_bund · cisa_csaf_ot

EPSS · scored 2026-10-27

Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then changing the origin to a different one (`hostB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Authorization:` header field meant for `hostA`, to `hostB`.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • FixedRTU500 series CMU Firmwarecisa_csaf_ot

    Update to CMU Firmware version 13.9.1

  • MitigationRTU500 series CMU Firmwarecisa_csaf_ot

    Follow general mitigation factors/workarounds

02

cvss

Technical severity, 0–10. One row per scoring source.

9.8
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.1–9.8

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · CISA US
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondaryexploitability 3.9 · impact 5.9
v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-294USprimaryCWE-294US
05

affected products (195)

Products and version ranges known to be affected.

showing 20 of 195
06

advisories (5)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2026-2052cURL: Mehrere SchwachstellenDeutsch2026-06-23csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in cURL ausnutzen, um Sicherheitsvorkehrungen zu umgehen, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand oder eine Speicherbeschädigung zu verursachen.

  • ICSA-26-293-05Hitachi Energy RTU500 Product2026-09-01icsa · cisa_csaf_otUS

    Hitachi Energy is aware of vulnerabilities that affect RTU500 product versions listed in this document. These vulnerabilities if exploited can have impact on confidentiality, integrity and availability of the product. Please refer to the Recommended Immediate Actions for information about the mitigation/remediation.

  • CERTFR-2026-AVI-1351Multiples vulnérabilités dans Oracle MySQLFrançais2026-10-21vendor · certfrFR
  • CERTFR-2026-AVI-1385Multiples vulnérabilités dans les produits VMwareFrançais2026-10-26vendor · certfrFR
  • CURL-CVE-2026-11856cross-origin Digest auth state leak2026-06-24vendor · osvUS

    Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then changing the origin to a different one (`hostB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Authorization:` header field meant for `hostA`, to `hostB`.

07

also known as (3)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcert_bundcisa_csaf_otcertfrosvNVDCVE.orgMITRE
published 2026-07-03modified 2026-07-07
10

references (9)

External citations — patches, advisories, analysis.

scry

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