Uncontrolled recursion in the ASN.1 parser (Asn1InputStream, Asn1StreamParser) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote unauthenticated attacker to cause a denial of service via a crafted ASN.1 encoding of deeply nested constructed elements (for example SEQUENCE inside SEQUENCE, in definite-length DER or indefinite-length BER form), because each nesting level is parsed by a further recursive call with no bound on depth. About 2,000 levels (8 KB of DER) are enough to exhaust a 1.5 MB thread stack, the .NET main-thread default on Windows, and raise a StackOverflowException, which .NET cannot catch and which terminates the whole process; on threads with larger stacks, parse time instead grows quadratically with depth (about 9 seconds of CPU for a 64 KB input). Any path that parses untrusted ASN.1 is exposed, including X.509 certificates and CRLs, CMS/PKCS#7, PKCS#8/PKCS#12, OCSP and TLS Certificate messages.
CVE-2026-103600
“—” beside the score: it is equal to NVD's CVSS score.
This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.4% (29th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2026-91230 (ENISA EUVD) · GHSA-xp76-rp77-x5w9 (GitHub Security Advisories)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5HIGHmedium confidence
- EG Risk
- 49EG Risk 49/100
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)Severity75% × 45%Impact severity (EG Severity): CVSS 7.5 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.Automatability100% × 15%CISA's SSVC Automatable value: yes (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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: An upstream fix is merged but not yet in a tagged release. Until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high, then apply it. - EPSS PROB
- 0.4%
- EPSS %ILE
- 29th
- 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 (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
- EG Likelihood
- 0.4% within 30 daysSource: FIRST EPSS. 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; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.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; Attend at high (mission-essential systems).
An upstream fix is merged but not yet in a tagged release. Until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high, then apply it.
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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; 60 days if it is not.
No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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
October 2, 2026
Last Modified
October 28, 2026
Advisory Details (3)
Auto-updated Oct 2, 2026commit b99f4e3dcea0 (bcgit/bc-csharp)
Fix landed in bcgit/bc-csharp commit b99f4e3dcea0 — awaiting tagged release
https://github.com/bcgit/bc-csharp/commit/b99f4e3dcea05b57becc79dfa6ad91a54c778d65commit 89c81b0da7fe (bcgit/bc-csharp)
Fix landed in bcgit/bc-csharp commit 89c81b0da7fe — awaiting tagged release
https://github.com/bcgit/bc-csharp/commit/89c81b0da7fe11cd70013285560bbc472cb73901CVE 2026 103600 · bcgit/bc-csharp Wiki · GitHub
https://github.com/bcgit/bc-csharp/wiki/CVE-2026-103600Vendor Advisories for CVE-2026-103600(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 12× in last 7d / 67× 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.
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. 2 repeat rows among the latest 81 are merged into the row they repeat.
- 2026-11-02 16:43 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-28 15:06 UTCEG score recompute▼ 1.20
- 2026-10-28 15:06 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-28 15:06 UTCNVD updateCVSS v3 → 7.5
- 2026-10-27 20:30 UTCEG score recompute
- 2026-10-27 20:30 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-25 14:56 UTCEG score recompute
- 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
- 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
- 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
- 2026-10-20 19:15 UTCEG score recompute
- 2026-10-20 19:15 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-18 05:09 UTCEG score recompute
Show 54 moreShow fewer
- 2026-10-17 19:43 UTCEG score recompute
- 2026-10-17 19:43 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-12 16:40 UTCEG score recompute
- 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-11 20:15 UTCEG score recompute
- 2026-10-11 18:28 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-11 18:28 UTCEG score recompute
- 2026-10-11 15:01 UTCEG score recompute
- 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-11 07:06 UTCEG score recompute
- 2026-10-11 07:06 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-10 19:43 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-10 08:21 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-09 20:59 UTCEG score recompute
- 2026-10-09 20:59 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-09 09:37 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-08 22:15 UTCEG score recompute
- 2026-10-08 22:15 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-08 10:54 UTCEG score recompute
- 2026-10-08 10:54 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-07 23:32 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-07 12:09 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-07 00:45 UTCEG score recompute
- 2026-10-07 00:45 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-06 13:20 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-06 01:59 UTCEG score recompute
- 2026-10-06 01:59 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-05 14:37 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-05 03:16 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-04 15:54 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-04 04:32 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-03 17:11 UTCEG score recompute
- 2026-10-03 17:10 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-03 05:46 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-02 18:20 UTCEG score recompute
- 2026-10-02 18:20 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-02 18:00 UTCEG score recompute
- 2026-10-02 18:00 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-02 14:45 UTCGHSA enrichmentGHSA-xp76-rp77-x5w9 · GitHub severity HIGH
- 2026-10-02 08:27 UTCEG score recompute
- 2026-10-02 07:31 UTCEG score recomputeFirst assessed: 8.7 HIGH
- 2026-10-02 07:30 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-103600?
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Dependency Blast Radius
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