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MIP: a solution whose repair LP fails to solve is discarded, losing the optimum and reporting a suboptimal solution as Optimal at gap 0

Status: Open.

#3180 In ERGO-Code/HiGHS;

· EamonHetherton opened on Jul 28, 2026

Objective scaling leads to inconsistent gaps in B&B

Code-quality

MIP

Status: Open.

#3178 In ERGO-Code/HiGHS;

· DanielHermosilla opened on Jul 27, 2026

MIP: presolve fixes a column whose bounds are equal only within tolerance without bounding the objective error, returning a suboptimal solution as Optimal

MIP

Presolve MIP

Status: Open.

#3173 In ERGO-Code/HiGHS;

· EamonHetherton opened on Jul 27, 2026

MIP: path-mixing cut is untransformed with different bound substitutions than its coefficients were built with, producing an invalid cut

Bug

MIP

Status: Open.

#3171 In ERGO-Code/HiGHS;

· EamonHetherton opened on Jul 26, 2026

MIP: invalid cut from a redundant variable bound gives a suboptimal solution reported as Optimal at gap 0

Bug

MIP

Status: Open.

#3170 In ERGO-Code/HiGHS;

· EamonHetherton opened on Jul 26, 2026

Out-of-bounds access in HighsSymmetryDetection::partitionRefinement

Bug

MIP

Status: Open.

#3166 In ERGO-Code/HiGHS;

· falk-hueffner opened on Jul 25, 2026

Give names of rows and columns if possible when logging illegal data in assessMatrix

EnhancementNew feature or requestNew feature or request

Status: Open.

#3164 In ERGO-Code/HiGHS;

· jajhall opened on Jul 23, 2026

HiPO build ignores user choice of BLAS on Apple

Build

Mac

Status: Open.

#3160 In ERGO-Code/HiGHS;

· odow opened on Jul 22, 2026

Linux release binaries require GLIBCXX_3.4.32; request for older toolchain build

Build

Linux

Status: Open.

#3154 In ERGO-Code/HiGHS;

· rdzman opened on Jul 18, 2026

highs_bindings defining PYBIND11_DETAILED_ERROR_MESSAGES breaks ODR for other sources using pybind

Python

Status: Open.

#3144 In ERGO-Code/HiGHS;

· NoLuckNoWin opened on Jul 8, 2026

Regression in dual-fixing presolve v1.14.0 -> v.1.15.1

Code-quality

LP

Presolve

Status: Open.

#3140 In ERGO-Code/HiGHS;

· slowjazz opened on Jul 7, 2026

Carry a basis through presolve

EnhancementNew feature or requestNew feature or request

LP

Presolve

Status: Open.

#3138 In ERGO-Code/HiGHS;

· jajhall opened on Jul 7, 2026